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.