C. Discarding
Explanation:
Forwarding: The port is actively forwarding data frames.
Listening: This is not a standalone state. It is part of the STP convergence process during which a port transitions from the Listening state to the Learning state.
Discarding: The port is in a blocking state and not forwarding data frames. This is part of the STP loop prevention mechanism.
Disabled: The port is administratively disabled and not participating in the STP process.
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