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.