What statement is true if a new switch with a lower bridge ID is introduced in a network with root guard enhancement?

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What statement is true if a new switch with a lower bridge ID is introduced in a network with root guard enhancement?
A . Prevent unknown switch be a root port
B . Root Guard puts the port into root-inconsistent
C . Allow two root bridges in a network
D . All ports of the new switch are changed to listening state

Answer: B