Learned about looping in other training as well. Port blocking prevents traffic from getting stuck going in circles between other ports. I would have to say it's D in this case
The STP loop guard feature provides additional protection against Layer 2 forwarding loops (STP loops). If BPDUs are not received on a non-designated port, and loop guard is enabled, that port is moved into the STP loop-inconsistent blocking state, instead of the listening / learning / forwarding state.
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