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.