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.