Refer to the exhibit.

The core routing switches will run OSPF. Which design provides the best failover and resiliency?

A.
One VLAN that extends across all the switch-to-switch links and a/24 subnet

B.
Two VLANs that extend all the switch-to-switch links and a/24 subnet for each VLAN

C.
A dedicated VLAN on each switch-to-switch link and a/30 subnet for each VLAN

Explanation: