What is not true about link encryption?

A.
Link encryption encrypts routing information.

B.
Link encryption is often used for Frame Relay or satellite links.

C.
Link encryption is suitable for high-risk environments.

D.
Link encryption provides better traffic flow confidentiality.

Explanation:
C: Link encryption is not suitable for high-risk environments due to possible privacy weakness at each node. It is possible that an attacker could view decrypted data as encrypt decrypt function is performed at each node along the data path. Page 320.