After Several Attempts, an Attacker Was Able to Gain Unauthorized

Multiple Choice

After several attempts, an attacker was able to gain unauthorized access through a biometrics sensor using the attacker's actual fingerprint without exploitation. Which of the following is the MOST likely explanation of what happened?

A) The biometric device is tuned more toward false positives.
B) The biometric device is configured more toward true negatives.
C) The biometric device is set to fail closed.
D) The biometric device duplicated a valid user's fingerprint.