What is a possible reason for this?

Scenario 2:

After completing the branch activation activities for all required branches, the network administrator attempts to test connectivity between the various branches and between the hubs and branches. The administrator notices a lack of connectivity despite being certain that configurations have been complete. The administrator also observed that several users are reporting intermittent connectivity to some of the applications they are accessing. Other users are reporting no access to these applications. Other users at some of the branches claim they cannot get to certain public resources. The administrator wants to

ensure that all sites can talk to each other and all resources are accessible.

Exhibit.

A network administrator is investigating connectivity issues between Chicago and San Jose. The administrator browses to the Overlay Flow Control (OFC) window and notices that the screen is blank with no routes shown in the OFC.

What is a possible reason for this?
A . Cloud VPN for the Edges / Profiles is not enabled.
B . There is an invalid MTU configuration at Chicago.
C . OSPF or BGP is not enabled.
D . The routing table on the Edges has not been initialized.

Answer: A