Which command is useful when troubleshooting AAA Authentication between a Cisco router and the AAA server?

Which command is useful when troubleshooting AAA Authentication between a Cisco router and the AAA server?
A . test aaa-server test cisco cisco123 all new-code
B . test aaa group7 tacacs+ auth cisco123 new-code
C . test aaa group tacacs+ cisco cisco123 new-code
D . test aaa-server tacacs+ group7 cisco cisco123 new-code

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Answer: C