Which two of these statements regarding RSTP are correct?

Which two of these statements regarding RSTP are correct? (Choose two.)
A. RSTP defines no new port states.
B. RSTP defines new port roles.
C. RSTP cannot operate with PVST+.
D. RSTP is a compatible with the original IEEE 802.1D STP.
E. RSTP is a proprietary implementation of IEEE 802.1D STP.

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