What statement best defines a staggered channel plan or multiple channel architecture (MCA)?

What statement best defines a staggered channel plan or multiple channel architecture (MCA)?
A . Alternating overlapping channels for APs without concern for physical space between APs
B . Using one channel for all APs and controlling which APs communicate with a centralized controller
C . Using one channel for all APs and reducing the output power on every other AP
D . Alternating non-overlapping channels for APs with sufficient physical space provided before reusing a
channel

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Answer: D