The senior network engineer typed the following commands on the R1.
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#interface g0/0/0
R1(config-if)#ip ospf cost 6
R1(config-if)#interface g0/1/0
R1(config-if)#ip ospf cost 7
R1(config-if)#^Z
What command will you type in order to confirm the OSPF interface costs?

(A) show ip ospf
(B) show ip ospf interface brief
(C) show ospf brief
(D) show ospf interface brief

show ip ospf interface brief is the correct answer. The command show ip ospf interface lists the interfaces on which the OSPF protocol is enabled and lists the cost settings.