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.