Which conditions will normally cause a SART to operate in the active mode?（）

A.It will respond only to interrogation by 9-Ghz radar signals

B.A SART will normally respond to interrogation from a searching vessel's radar if the radar antenna is at least 15 meters high

C.A SART will normally respond to interrogation from a searching aircraft's radar if the radar's output power is at least 10，000 watts and the aircraft is at a height of 3000 feet and within 30 nautical miles

D.All of the above