Why would you need to know about neighbor 802.11 networks to create an effective WLAN implementation plan for a site?

Why would you need to know about neighbor 802.11 networks to create an effective WLAN implementation plan for a site?
A . To determine the vendor they have implemented
B . To determine the security solutions they have implemented
C . To ensure the use of the right version of 802.11
D . To determine the channels they are using

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Answer: D