Which of the following type of authentication mechanism is this?

An organization has introduced token-based authentication to system administrators due to risk of
password compromise. The tokens have a set of numbers that automatically change every 30
seconds. Which of the following type of authentication mechanism is this?

A.
TOTP

B.
Smart card

C.
CHAP

D.
HOTP

Explanation:
Time-based one-time password (TOTP) tokens are devices or applications that generate

passwords at fixed time intervals. In this case, it’s every 30 seconds.