Which of the following types of security services are used to support authentication for remote users and
devices?

A.
Biometrics

B.
HSM

C.
RADIUS

D.
TACACS

Explanation:
RADIUS authentication phase takes place when a network client connects to a network access server (NAS)
and provides authentication credentials. The NAS will then make use of the authentication credentials to issue
a RADIUS authentication request to the RADIUS server, which will then exchange RADIUS authentication
messages with the NAS.