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

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.

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Answer: D