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單項選擇題

The router receives a login request from a PPP over ATM client and examines the domain map for the client's domain. The router finds no entries currently configured within the domain map.
What does the router do with the login request?（）

A. The router rejects it.
B. The router tunnels it via L2TP.
C. The router authenticates it locally.
D. The default virtual router authenticates it.

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