Which output is expected in the blank line?

Refer to the exhibit.

Which output is expected in the blank line?
A . DOWN
B . EXSTART
C . LOADING
D . EXCHANGE

Answer: B

Explanation:

Neighbors Stuck in Exstart/Exchange State

The problem occurs most frequently when attempting to run OSPF between a Cisco router and another

vendor’s router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces don’t match. If the router with the higher MTU sends a packet larger that the MTU set on the neighboring router, the neighboring router ignores the packet.

Reference: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13684-12.html