Refer to the exhibit and the partial configuration on router R1 and R2

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 changedin
the configuration to fix the problem?

A.
R2 should be configured with an HSRP virtual address

B.
R2 should be configured with a standby priority of 100

C.
The Serial0 interface on router R2 should be configured with a decrement value of 20

D.
The Serial0 interface on router R1 should be configured with a decrement value of 20