An engineer is designing a network using RSTP. Several devices on the network support only legacy STP. Which outcome occurs?

A.	RSTP and STP choose the protocol with the best performance.
B.	RSTP and STP interoperate and fast convergence is achieved.
C.	RSTP and STP are not compatible and legacy ports error disable.
D.	RSTP and STP interoperate, but the fast convergence is not used.