When setting up a wireless network with multiple access points, why is it important to set each access point on a different channel?

When setting up a wireless network with multiple access points, why is it important to set each access point on a different channel?
A . Multiple access points can be set up on the same channel without any issues
B . Avoid over-saturation of wireless signals
C . So that the access points will work on different frequencies
D . Avoid cross talk

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Answer: D