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

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

A.
Switch2 is the root bridge.

B.
Spanning Tree is not running.

C.
HostD and Server1 are in the same subnet.

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

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

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