The following description of the role of the coupler, which is wrong? (Multiple choice)

The following description of the role of the coupler, which is wrong? (Multiple choice)
A . The multi-input signal Synthesis of all the way output, reverse the mixed signal filter separation
B . divide the signal into multiple outputs on average
C . remove the required signal energy from the main line to the near-end antenna, and allocate more signal energy to the far-end antenna
D . Connect the AP’s RF port to the antenna interface

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Answer: ABD