capsman wireless chains configuration

i am deploying capsman in a new installation with rbwap2nd caps.
so if i want to use chains 0,1 (rbwap2nd supports 2 chains) should i checked in configuration tab? or by default all chains are used?
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one more question. if at capsman configuration i check 0,1,2 for tx/rx and my caps ap supports only 0,1 chain

  1. is there a problem in that? caps will use only 0,1 and 2 ignored?
  2. if i dont check anything in capsman chain configuration, what chains caps will use?
  3. how can i check in caps or capsman what chains are being used by a cap?