Refer to the exhibit. The indicated configuration was established on the HSRP standby router RTB. However, the console message %IP-4-DUPADDR started appearing almost immediately on the RTB router. Given the output of the show standby brief command on RTA.
A. The command standby preempt should only be applied on the active router
B. The subnet mask is missing from the standby IP 10.1.1.1 command
C. The group number 50 is missing in the Router RTB configuration commands.
D. The priority number 150 is missing in the Router RTB configuration commands.
E. The virtual IP address should be the same as the active router
F. The ports on the switch must be configured with the spanning-tree PortFast feature.