A.3dBm B.4dBm C.5dBm D.6dBm
A.RegiStRAtioN B.teRmiNAtiNgCoNveRSAtioNCAll C.oRigiNAtiNgCoNveRSAtioNCAll D.DetACh
A.1/2 B.1/3 C.1/4 D.1/5