Which three statements are true about TACACS+？（）
A. It is a Cisco proprietary protocol.
B. It runs on TCP port 59. .
C. Authentication and authorization are done at different stages.
D. TACACS+ encrypts the entire body of the packet， but leaves a standard TACACS+ header.
E. It is an industry standard protocol.
F. TACACS+ encrypts both the entire body of the packet and the TACACS+ header.
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