Which of the following descriptions of HWTACACS protocol features is incorrect?

Which of the following descriptions of HWTACACS protocol features is incorrect?
A . Use shared key encryption, but only encrypt the password field in the authentication message.
B . Supports authorized use of configuration commands on the device, mostly used for device authentication
C . Based on TCP transport layer protocol, network transmission reliability is high
D . Authentication, authorization and accounting functions are separated, so authentication, authorization and accounting services can be deployed on different servers respectively.

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Answer: A