Which two of these statements regarding RSTP are correct? (Choose two.)

A.
RSTP cannot operate with PVST+.

B.
RSTP defines new port roles.

C.
RSTP defines no new port states.

D.
RSTP is a proprietary implementation of IEEE 802.1D STP.

E.
RSTP is compatible with the original IEEE 802.1D STP.