Which three statements about RSTP are

Which three statements about RSTP are true?（）

ARSTP significantly reduces topology reconverging time after a link failure.
BRSTP expends the STP port roles by adding the alternate and backup roles.
CRSTP port satates are blocking,discarding,learing,or forwarding.
DRSTP also uses the STP proprsal-agreement sequence.
ERSTP use the same timer-baseed process as STP on point-to-point links.
FRSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

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