which ports are root ports?

Refer to the network exhibit.

Assume the network shown in the exhibit has implemented RSTP Based on the topology, which
ports are root ports? (Select two)

A.
SwitchA port 2

B.
SwitchB port 2

C.
SwitchB port 1

D.
SwitchD port 2

E.
SwitchC port 2

Explanation: