單項選擇題

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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