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單項選擇題

The output of the show aaa domain-map displays the following information:
Domain: isp1.com; virtual-router: vr1; loopback: 1
Domain: isp2.com; virtual-router: vr2; loopback: 1
Domain: none; virtual-router: vr3; loopback: 1
Domain: default; virtual-router: vr4; loopback: 1
The end user supplies a login name of joe@isp7.com .
Which virtual router is responsible for authenticating this user?()

A. vr1
B. vr2
C. vr3
D. vr4

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