Which statement describes an STP port that is placed into a blocking state?

A. When a port is placed into a blocking state, it blocks all frames, including BPDUs.
B. When a port is placed into a blocking state, it blocks redundant frames, excluding BPDUs.
C. When a port is placed into a blocking state, it blocks all frames, excluding BPDUs.
D. When a port is placed into a blocking state, it blocks redundant frames, including BPDUs.

C. An STP blocked port will block all frames from being forwarded. The blocking excludes BPDUs, which it will continue to listen for and calculate future topology decisions.