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?
A. The interface is down at Layer 2; it is not available for sending or receiving any traffic.
B. The interface does not forward or accept data traffic, but it is ready to start forwarding if interface 19 fails.
C. The interface is an edge port but has received Bridge Protocol Data Units (BPDUs), so it is disabled.
D. The interface does not support spanning tree: it is possible that it will introduce a loop in the network.
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