Which STP protection feature should you use to prevent an inadvertent change in topology caused
by the receipt of a superior BPDU on an access interface?

A.
BPDU protection
B.
loop protection
C.
root protection
D.
topology protection
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it is used on edge ports. in this question the question is referring to preventing a port on the root switch transitioning to a forwarding state where another switch takes over root, think adding a new switch to the network thats already got a configuration and takes over root.
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