Which IOS QoS mechanism is used strictly to rate limit traffic destinedto the router itself？（）

A. The client and the NAS.
B. The NAS andthe LNS.
C. The NAS and the LAC.
D. The client and the LNS.

A. PFS group.
B. Encryption algorithm.
C. Hashing Algorithm.
D. Authenticationmethod.
E. Lifetime duration.

A. The sender of the message.
B. The receipient of the message.
C. The sender’s administrator who provides the sender with the PGP program.
D. A third party that belongs to what’s often known as "web of trust"， that can verify the relationship between the user and the key.
E. The vendor of the PGP program.