What are the general methods to solve co-channel interference (). (Select 3 Answers)

What are the general methods to solve co-channel interference (). (Select 3 Answers)
A . adjust AP Transmit power, adjust antenna feeder
B . Reasonable frequency reuse to ensure that the same channel does not appear in the same or adjacent coverage areas
C . Use omnidirectional antennas for coverage
D . Use obstacles for natural isolation

Answer: A,B,D