单选题Prior to 802.1w，Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct？（）AOnly UplinkFast and BackboneFast are specified in 802.1w；PortFast must be manually configured.BOnly PortFast is specified in 802.1w；UplinkFast and BackboneFast must be manually configured.CNone of the proprietary Cisco enhancements are specified in 802.1w.DPortFast，UplinkFast，and BackboneFast are specified in 802.1w.
单选题
Prior to 802.1w，Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct？（）
A
Only UplinkFast and BackboneFast are specified in 802.1w；PortFast must be manually configured.
B
Only PortFast is specified in 802.1w；UplinkFast and BackboneFast must be manually configured.
C
None of the proprietary Cisco enhancements are specified in 802.1w.
D
PortFast，UplinkFast，and BackboneFast are specified in 802.1w.
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