Which of the following security methods requires that a user enter a passcode that is changed at regular intervals?

WPA (Wi-Fi Protected Access) is a wireless network encryption protocol and does not involve user-facing passcodes that change on a timer.

Biometrics authenticates users via physical characteristics such as fingerprints or facial recognition, which do not change at regular intervals.

PSK (Pre-Shared Key) is a static passphrase configured manually on both ends of a connection and does not change automatically on a schedule.

RSA tokens (hardware or software) use the Time-based One-Time Password (TOTP) algorithm to generate a new numeric passcode every 30 or 60 seconds, synchronized with an authentication server. The user enters the current token value along with their PIN or password, making it a form of multi-factor authentication. Because the code expires after each interval, intercepted codes are useless to an attacker.