【单选题】
A Make sure that the ATC transponders are in standby mode when you simulate altitude. You can accidentally cause false TCAS targets.
B To make sure that ATC transceivers are in standby mode, you must simulate altitude, otherwise false TCAS signals may occur intermittently.
C Make sure the ATC transmitters are in standby mode,or false TCAS targets may occur accidentally due to altitude simulation.
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