What does the command aaa authentication login default group radius local do?

What does the command aaa authentication login default group radius local do?
A . First, a RADUIS server authenticates the users.
If the credentials are incorrect, the local router database is used.
B . First, a RADUIS server authenticates the users.
If the server fails to respond, a remote router database is used.
C . First, a RADIUS server authenticates the users.
If the server fails to respond, the local router database is used.
D . First, the router local database authenticates the users.
If it fails to respond, a RADUIS server authenticates the users.

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Answer: C