A security administrator is tackling issues related to authenticating users at a remote site. There

have been a large number of security incidents that resulted from either tailgating or impersonation
of authorized users with valid credentials. The security administrator has been told to implement
multifactor authentication in order to control facility access. To secure access to the remote facility,
which of the following could be implemented without increasing the amount of space required at
the entrance?

A.
MOTD challenge and PIN pad

B.
Retina scanner and fingerprint reader

C.
Voice recognition and one-time PIN token

D.
One-time PIN token and proximity reader

Explanation:
Authentication systems or methods are based on one or more of these five factors:
Something you know, such as a password or PIN
Something you have, such as a smart card, token, or identification device
Something you are, such as your fingerprints or retinal pattern (often called biometrics)
Something you do, such as an action you must take to complete authentication
Somewhere you are (this is based on geolocation)
Multifactor authentication is authentication that uses two of more of the authentication factors
listed above.
In this question, we can use voice recognition (something you are) and a one-time PIN token
(something you have) to provide two factors of authentication. The one-time PIN token is a small
device that generates a one-time PIN to enable access.