What is the effect of the following command, entered at the CLI of an HP A9500 switch?
[A9500-GigabitEthernet2/0/1] stp root-protection
A. The switch will listen for Spanning Tree BPDUs only on port 2/0/1.
B. The switch will maintain 2/0/1 as its Root Port regardless of changes in the Spanning Tree topology.
C. The switch will transition instantly to Root if it stops receiving BPDUs through port 2/0/1.
D. The switch will not allow another switch to promote itself as Root on port 2/0/1.
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