Refer to the exhibit. Which Virtual Router Redundancy Protocol （VRRP） statement is true about the  roles of the master virtual router and the backup virtual router？（）<br /> <img src="https://nimg.ppkao.com/2018-07/luke/20180724105948386.jpg?sign=75db09770c6ce06080824e8a9fdefca4&t=62d24888" />
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 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.
C、 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.
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， it will regain the master virtual router role.
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