单项选择题
A. On R2 add the command standby 1 priority 80
B. On R1 add the command standby 1 priority 110
C. On R1 add the command standby 1 priority 80
D. On R2 remove the command standby 1 preempt
单项选择题 Refer to the exhibit. What statement is true based upon the configuration of router R1 and router R2？（）
单项选择题 .Refer to the exhibit and the partial configuration on routers R1 and R2. Hot Standby Routing Protocol （HSRP） is configured on the network to provide network redundancy for the IP traffic. The network administrator noticed that R2 does not become active when the R1 serial0 interface goes down. What should be changed in the configuration to fix the problem？ （）
单项选择题 Refer to the exhibit. Based on the debug standby output in the exhibit， which HSRP statement is true？ （）
