Implementing Cisco IP Switched Networks (SWITCH v2-0) (#13)

What is the effect of configuring the following command on a switch? Switch(config) # spanning-tree portfast bpdufilter default

If BPDUs are received by a port configured for PortFast, then PortFast is disabled and the BPDUs are processed normally.
If BPDUs are received by a port configured for PortFast, they are ignored and none are sent.
If BPDUs are received by a port configured for PortFast, the port transitions to the forwarding state.
The command enables BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level.