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Study the exhibit shown below carefully.

In this scenario the service provider wants to ensure that switch S1 is the root switch for its own network and the network of . 
On which interfaces should root guard be configured to ensure that this happens?()
 

A.Interfaces 11 and 12
B.Interfaces 1, 2, 3, and 4
C.Interfaces 5 and 6
D.Interfaces 5, 6, 7, and 8
E.Interfaces 1 and 2
F.Interfaces 1, 3, 5, and 6

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