정답: D
The indicator that is generally indicative of a replay attack when dealing with biometric authentication is an exact match. A replay attack is a type of attack or a threat that aims or intends to bypass or to break the authentication or the verification mechanism or process of a system or a service, by capturing or recording the authentication or the verification data or information, such as the username, the password, or the token, and replaying or resending the authentication or the verification data or information to the system or the service, as if it was the legitimate or the authentic user or device. A replay attack can result or lead to the unauthorized or the inappropriate access or login to the system or the service, by the attacker or the malicious actor. Biometric authentication is a type of authentication or a verification mechanism or process that uses or applies the biometric features or characteristics of the user or the device, such as the fingerprint, the iris, or the voice, to identify or to authenticate the user or the device, and to grant or to deny the access or the login to the system or the service. Biometric authentication can provide a high level of security or protection for the system or the service, as it can prevent or reduce the risk of impersonation, duplication, or sharing of the biometric features or characteristics of the user or the device. However, biometric authentication can also be vulnerable or susceptible to the replay attack, as the attacker or the malicious actor can capture or record the biometric features or characteristics of the user or the device, such as by using a camera, a scanner, or a microphone, and replay or resend the biometric features or characteristics to the system or the service, as if it was the legitimate or the authentic user or device. The indicator that is generally indicative of a replay attack when dealing with biometric authentication is an exact match, which means that the biometric features or characteristics of the user or the device that are captured or recorded by the attacker or the malicious actor, and that are replayed or resent to the system or the service, are identical or indistinguishable to the biometric features or characteristics of the user or the device that are stored or registered in the system or the service, and that are used or compared for the authentication or the verification. An exact match can indicate or suggest that the biometric features or characteristics of the user or the device are not genuine or live, but rather fake or replayed, and that the authentication or the verification mechanism or process of the system or the service is compromised or breached by the replay attack.
