Refer to the exhibit. Which sequence of commands should be used to configure router A for OSPF?

To configure router A for OSPF with the network addresses shown in the exhibit, you’d need to use the following sequence of commands:

Here’s the breakdown:

• The router ospf 1 command starts OSPF configuration and assigns a process ID of 1. The process ID is locally significant to the router.
• The network commands are used to specify which interfaces will participate in OSPF. The addresses are the network addresses, and the numbers following them are wildcard masks. The wildcard mask is the inverse of the subnet mask. For a /26 subnet, the subnet mask is 255.255.255.192, which translates to a wildcard mask of 0.0.0.63. For a /30 subnet, the subnet mask is 255.255.255.252, which translates to a wildcard mask of 0.0.0.3.
• Each network command is followed by area 0, which assigns the interfaces to OSPF Area 0, as indicated in the diagram.

The other sequences of commands have either incomplete network statements, missing area designations, or incorrect wildcard masks.