The following was configured on a switch： Switch（config） # spanning-tree portfast bpdufilter default What is the effect of this configuration command？（）

A. If BPDUs are received by a port configured for PortFast， they are ignored and none are sent.
B. The command will enable BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level.
C. If BPDUs are received by a port configured for Portfast， the port will transition to forwarding state.
D. If BPDUs are received by a port configured for PortFast， then PortFast is disabled and the BPDUs are processed normally.
E. None of the other alternatives apply.