Refer to the exhibit and the partial configuration on router 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 became active when the R1 serial0 interface goes down. What should be changed in the
configuration to fix the problem?

A.
R2 should be configured with a HSRP virtual address

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

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

D.
The Serial1 interface on router R2 should be configured with a decrement value of 20