avoid Layer 2 loops. Which two of the following are most probably the reasons for that preference?（）
A. Information about port roles is sent to all switches.
B. RSTPs that are based on Cisco products require no additional configuration.
C. Features such as UplinkFast and BackboneFast are compatible with RST
D. An RSTP that is based on Cisco products generally performs better than the Cisco proprietary 802.1D enhancements.
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