Refer to the exhibit.

This switch currently assigns all VLANs to MSTP instance 0 or the Internal Spanning Tree (IST).
Which statement correctly describes interface 21?
Select an option, then click Submit answer.
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The interface is down at Layer 2; it is not available for sending or receiving any traffic.
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The interface does not forward or accept data traffic, but it is ready to start forwarding if interface 19 fails.
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The interface is an edge port but has received Bridge Protocol Data Units (BPDUs), so it is disabled.
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The interface does not support spanning tree; it is possible that it will introduce a loop in the network.


