642-813 v200~题库第151题,答案是a还是c呢?

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请问大大,642-813 v200~题库第151题,答案是a还是c呢?题库答案好像怪怪的,烦请解答,thx
Which Virtual Router Redundancy Protocol (VRRP) statement is true about the roles of the master virtual
router and the backup virtual router?

A. Router A is the master virtual router, and Router B is the backup virtual router. When Router A fails,
Router B will become the master virtual router. When Router A recovers, Router B will maintain the role
of master virtual router.
B. Router B is the master virtual router, and Router A is the backup virtual router. When Router B fails,
Router A will become the master virtual router. When Router B recovers, it will regain the master virtual
router role.
C. Router A is the master virtual router, and Router B is the backup virtual router. When Router A fails,
Router B will become the master virtual router. When Router A recovers, it will regain the master virtual
router role.
D. Router B is the master virtual router, and Router A is the backup virtual router. When Router B fails,
Router A will become the master virtual router. When Router B recovers, Router A will maintain the role
of master virtual router.
Answer: C

Explanation/Reference:
A的priority比较高，故A为active，但由于没有配置preempt，故当A fail后 B成为active，然后A也起来后，B
还是active。.

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