Which command do you enter on a device so that users are automatically placed in enable mode after they authenticate with TACACS+?

Which command do you enter on a device so that users are automatically placed in enable mode after they authenticate with TACACS+?
A . aaa authorization exec default group tacacs+ if-authenticated
B . aaa authorization exec default group tacacs+ local-case
C . aaa authorization exec default group tacacs+ enable
D . aaa authentication exec default group tacacs+ if-authenticated

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Answer: A