Explanation:
Azure Active Directory (AD) is the centralized identity and access management solution for Azure resources. To create a new user for an Azure subscription, you need to use Azure AD. You can create a new user by adding a new account to your Azure AD tenant and then assign the appropriate role to the user to manage resources within the Azure subscription. Once the user has the necessary permissions, they can log in to the Azure portal and manage resources within the subscription.

Explanation:
Box 1: Microsoft Sentinel
Microsoft Sentinel is a scalable, cloud-native, security information and event management (SIEM) and security orchestration, automation, and response (SOAR) solution. Microsoft Sentinel delivers intelligent security analytics and threat intelligence across the enterprise, providing a single solution for attack detection, threat visibility, proactive hunting, and threat response.
Box 2: Microsoft Defender for Cloud
You can find your overall secure score, as well as your score per subscription, through the Azure portal. Defender for Cloud displays your secure score prominently in the portal.
Box 3: Azure Key Vault
A favored approach to store the credentials or keys in the Azure Key Vault as secrets and reference the secrets as environment variables in our Azure functions apps.
Reference:
https://docs.microsoft.com/en-us/azure/sentinel/overview
https://docs.microsoft.com/en-us/azure/defender-for-cloud/secure-score-access-and-track
https://levelup.gitconnected.com/a-secure-way-to-use-credentials-and-secrets-in-azure-functions-
7ec91813c807

The command can be run in the Azure Cloud Shell.
The Azure Cloud Shell is a free interactive shell. It has common Azure tools preinstalled and configured to use with your account.
To open the Cloud Shell, just select Try it from the upper right corner of a code block. You can also launch Cloud Shell in a separate browser tab by going to https://shell.azure.com/bash.
References:
https://docs.microsoft.com/en-us/azure/virtual-machines/linux/quick-create-cli

Explanation:
Box 1: Yes
Azure Service Health consists of three components: Azure Status, Azure Service Heath and Azure Resource Health.
Azure service health provides a personalized view of the health of the Azure services and regions you're using. This is the best place to look for service impacting communications about outages, planned maintenance activities, and other health advisories because the authenticated Azure Service Health experience knows which services and resources you currently use. To view the health of all other services available in Azure, you would use the Azure Status component of Azure Service Health. Azure status informs you of service outages in Azure on the Azure Status page. The page is a global view of the health of all Azure services across all Azure regions.
Box 2: Yes
The best way to use Service Health is to set up Service Health alerts to notify you via your preferred communication channels when service issues, planned maintenance, or other changes may affect the Azure services and regions you use.
Box 3: No
You can use Resource Health to view the health of a virtual machine. However, you cannot use Resource Health to prevent a service failure affecting the virtual machine. Azure resource health provides information about the health of your individual cloud resources such as a specific virtual machine instance.
References:
https://docs.microsoft.com/en-us/azure/service-health/overview

Azure allows you to build, deploy, and manage apps more quickly and easily without having to buy and/or maintain the underlying infrastructure.
Azure provides flexibility between CapEx and OpEx
Capital expenditures generate benefits over a long period. These expenditures are generally nonrecurring and result in the acquisition of permanent assets.
Building an application could qualify as a capital expenditure. Example, Azure Reserved Instances (Azure RI) help Azure's most active customers save on long- term VM usage reserving VMs in advance at a discounted price by committing to a one or three-year benefits.
Operating expenditures are ongoing costs of doing business. Consuming cloud services in a pay- as-you-go model could qualify as an operating expenditure.
Example, you pay for a service or product as you use it i.e. pay-as-you-go pricing.
Reference:
https://www.protechtraining.com/blog/post/top-5-benefits-of-microsoft-azure-for-business-934
https://www.azureguru.org/capex-vs-opex/#