一道RSTP协议，极难懂，求解析？

UID: 98713

QUESTION 352
Which three statements about RSTP are true?(choose three)
A. RSTP significantly reduces topology reconverging time after a link failure.
B. RSTP expends the STP port roles by adding the alternate and backup roles.
C. RSTP port atates are blocking,discarding,learing,or forwarding.
D. RSTP also uses the STP proprsal-agreement sequence.
E. RSTP use the same timer-baseed process as STP on point-to-point links.
F. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
Answer: ABF
Section: New
Explanation/Reference:
A能够减少汇聚时间
B比STP增加了端口角色alternat和backup
F在点到点链路提供比STP更快的传输和转发


主要是D E 选项，根本看不懂意思，求解析？

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