Which of the following is BEST suited for secure communications within a small group?

A.
Key distribution center

B.
Certification authority

C.
Web of trust

D.
Kerberos Authentication System

Explanation:
Web of trust is a key distribution method suitable for communication in a small group. It ensures pretty good
privacy (PGP) and distributes the public keys of users within a group. Key distribution center is a distribution
method suitable for internal communication for a large group within an institution, and it will distribute symmetric
keys for each session. Certification authority is a trusted third party that ensures the authenticity of the owner of
the certificate. This is necessary for large groups and formal communication. A Kerberos Authentication System
extends the function of a key distribution center, by generating ‘tickets’ to define the facilities on networked
machines which are accessible to each user.