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單項選擇題

A customer would like to create a 1:1 protection group with a DS3Ni-12 card. 
Where should it be placed in the chassis?()

A. only Slots 6 or 12
B. only Slots 3 or 15
C. high or low speed slots
D. directly adjacent to the working card
E. high-speed slots only (5/6 and 12/13)

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