Why would you configure root protection?

Why would you configure root protection?
A . You want to prevent unwanted user authentication to the root bridge by defining an acceptable source-address list for authorized access.
B . You want to avoid a broadcast storm that originates on the root bridge.
C . You want to protect your network from unwanted topology changes from a rogue switch attempting to become the root bridge.
D . You want to protect the root bridge from receiving BPDUs on unauthorized interfaces.

Answer: C