The following was configured on a switch： Switch（config） # spanning-tree portfast bpdufilter default What is the effect of this configuration command？（）
- AIf BPDUs are received by a port configured for PortFast， they are ignored and none are sent.
- BThe command will enable BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level.
- CIf BPDUs are received by a port configured for Portfast， the port will transition to forwarding state.
- DIf BPDUs are received by a port configured for PortFast， then PortFast is disabled and the BPDUs are processed normally.
- ENone of the other alternatives apply.