which switch is best as the root switch for VLAN 20?

Refer to the topology.

If most of the communication is between hosts and the servers, which switch is best as the root switch for VLAN 20?

Exhibit:

A.
Sw-A

B.
Sw-B

C.
Sw-C

D.
Sw-D

E.
Sw-E

Explanation:

Server 3 and Server 4 belong to VLAN 20 and are connected to Switch-E. If the question asks which switch is best for the whole network then the answer should be Switch-B because it is the most centralized switch on the network.