Which statement is correct about the internetwork shown in the diagram?

Which statement is correct about the internetwork shown in the diagram?

A.
Switch 2 is the root bridge.

B.
Spanning Tree is not running.

C.
Host D and Server 1 are in the same network.

D.
No collisions can occur in traffic between Host B and Host C.

E.
If Fa0/0 is down on Router1, Host A cannot access Server1.

F.
If Fa0/1 is down on Switch3, Host C cannot access Server 2.