Multi-floor deployment in a building AP When, the factor that needs attention is (). (Select 3 Answers)

Multi-floor deployment in a building AP When, the factor that needs attention is (). (Select 3 Answers)
A . The material of the wall
B . Other interference signals
C . In order not to affect the beauty, AP Should be hidden in the ceiling
D . Unified planning channel

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Answer: A,B,D