问题：

[多选] Which two differentiators make RSTP the preferred protocol for preventing Layer 2 loops in a switchednetwork environment?（） (Choose two.)

A . Features such as UplinkFast and BackboneFast are compatible with RSTP.
B . An RSTP that is based on Cisco products generally performs better than the Cisco proprietary 802.1D enhancements.
C . Cisco proprietary enhancements are not transparent.
D . Information about port roles is sent to all switches.
E . RSTPs that are based on Cisco products require no additional configuration.