Which statement correctly describes enabling BPDU guard on an access port that is also enabled for PortFast？（）
- AUpon startup， the port transmits 10 BPDUs. If the port receives a BPDU， PortFast and BPDU guard are disabled on that port and it assumes normal STP operation.
- BThe access port ignores any received BPDU.
- CIf the port receives a BPDU， it is placed into the error-disable state.
- DBPDU guard is only configured globally and the BPDU filter is required for port-level configuration.