What is a common feature of biometric access control systems?

Biometric access control systems are designed to authenticate individuals based on their unique physical characteristics, such as fingerprints, facial recognition, iris scans, or voice patterns. This method of identification is highly secure because these biometric attributes are inherently unique to each person, making it extremely difficult for unauthorized individuals to gain access using someone else's credentials.

In contrast to the other options, which do not represent defining features of biometric systems, the reliance on physical traits is the hallmark of biometric technology. Passwords can be forgotten or stolen, magnetic stripes are easily duplicated, and time schedules are merely administrative settings rather than identification methods. The unique aspect of biometrics allows for a more reliable and secure system for access control.