The Cisco Email Security Appliance can be managed with both local and external users of different privilege levels. What three external modes of authentication are supported? (Choose three.)

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The Cisco Email Security Appliance can be managed with both local and external users of different privilege levels. What three external modes of authentication are supported? (Choose three.)
A . LDAP authentication
B . RADIUS Authentication
C . TACAS
D . SSH host keys
E . Common Access Card Authentication
F . RSA Single use tokens

Answer: A,B,D