Activity log events - An alert can trigger on every event, or, only when a certain number of events occur.
Incorrect Answers:
C: Metric values - The alert triggers when the value of a specified metric crosses a threshold you assign in either direction. That is, it triggers both when the condition is first met and then afterwards when that condition is no longer being met.
Reference:
https://docs.microsoft.com/en-us/azure/azure-sql/database/alerts-insights-configure-portal

Explanation:
Box 1: RESTORE
Use RESTORE WITH NORECOVERY for every restore operation.
BOX 2: NORECOVERY
Reference:
https://docs.microsoft.com/en-us/sql/database-engine/availability-groups/windows/manually- prepare-a-secondary-database-for-an-availability-group-sql-server? view=sql-server-ver15

Change automated backup settings for Azure SQL Database
You can modify automated backup settings for Azure SQL Database, such as the short-term retention policy and the backup storage redundancy option that's used for backups.
To change differential backup frequency, select 12 Hours or 24 hours from the drop-down menu under Differential backup frequency.
Step 1: Go to the logical server in Azure with the databases whose retention period you want to change.
Step 2: Select Backups on the left pane, and then select the Retention policies tab.
Step 3: Select the databases for which you want to change the PITR backup retention. [Select db2] Step 4: Select Configure policies from the action bar.
Step 5: To change the retention period for point-in-time restore backups, use the slider under Point-in-time restore. [Skip] Step 6: To change the PITR (point-in-time recovery) backup retention period or the differential backup frequency for active databases by using the Azure portal: [Skip]

Step 7: In Long-term retention, Monthly LTR Bakcups, Set Keep the first backup of each month for: 5 Years Question: The monthly backups must be retained for five years, and then deleted.
Reference:
https://learn.microsoft.com/en-us/azure/azure-sql/database/automated-backups-change-settings

Explanation:
Box 1: ..with CHECKSUM option
Azure Database Migration Service does not initiate any backups, and instead uses existing backups, which you may already have as part of your disaster recovery plan, for the migration. Be sure that you take backups using the WITH CHECKSUM option.
Box 2: An SMB share
For online migrations from SQL Server to SQL Managed Instance using Azure Database Migration Service, you must provide the full database backup and subsequent log backups in the SMB network share that the service can use to migrate your databases.
Reference:
https://docs.microsoft.com/en-us/azure/dms/tutorial-sql-server-managed-instance-online