Refer to the following exhibit. You want to make Router D the designated router. Which command will assure that it becomes the designated router?

A. RouterD(config-router)#ospf priority
B. RouterD(config-if)#ip ospf priority 10
C. RouterD(config-if)#ip address 192.168.5.2 255.255.255.0
D. RouterD(config-if)#ip ospf cost 15

B. The command ip ospf priority 10 will change the interface’s default priority of 1 to 10. This router will always become the designated router on the LAN.