Which four Cisco Spanning Tree Protocol enhancements are supported with rapid per-VLAN Spanning-Tree plus?（）
- A、PortFast
- B、UplinkFast
- C、loop guard
- D、root guard
- E、BPDU guard
- F、BackboneFast
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Which four Cisco Spanning Tree Protocol enhancements are supported with rapid per-VLAN Spanning-Tree plus?（）
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