Which of the following statements correctly describes a difference between pre-shared secrets
and certificates, as implemented in gateway-to-gateway encryption in VPN-1/FireWall-1?

A.
A pre-shared secret is an attribute of a single entity, but a certificate is an attribute of a pair of
entities.

B.
A pre-shared secret is an attribute of a pair of entities, but a certificate is an attribute of a single
entity.

C.
Both a pre-shared secret and a certificate are attributes of a pair of entities.

D.
Both a pre-shared secret and certificate are attributes of a single entity.

E.
None of the above.