What occurs when PortFast is enabled on an interface that is connected to another switch?

What 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 fails to detect a switching loop increasing the likelihood of broadcast storms.