單項選擇題

A customer requires a 2-way solution now that will be the easiest and least disruptive to upgrade to a 4-way in the future.  Which of the following solutions best matches these requirements?()

A.p630 2-way Active 2-way Inactive
B.p655 2-way Active 2-way Inactive
C.p5-520 2-way Active 2-way Inactive
D.p5-550 2-way Active 2-way Inactive

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