Which result occurs when PortFast is enabled on an interface that is connected to another switch?
A . Root port choice and spanning tree recalculation are accelerated when a switch link goes down.
B . After spanning tree converges, PortFast shuts down any port that receives BPDUs.
C . VTP is allowed to propagate VLAN configuration information from switch to switch automatically.
D . Spanning tree may fail to detect a switching loop in the network that causes broadcast storms.