Refer to the exhibit.

Users that are connected to switch SWD are complaining about slow performance when they are
doing large file transfers from a server connected to switch SWB. All switches are running PVST+.
Which option will improve the performance of the file transfers?

A.
Reconnect the clients from switch SWD to switch SWA.

B.
Reconnect the clients from switch SWD to switch SWC.

C.
Change PVST+ to RSTP.

D.
Change the STP root switch from switch SWA to switch SWB.

E.
Configure an EtherChannel between switch SWB and switch SWC.

Explanation:
When SWA is the root bridge the traffic path will be SWD <-> SWC <-> SWA <-> SWB
When SWB is the root bridge the traffic path will be SWD <-> SWC <-> SWB