题目内容
（请给出正确答案）
[主观题]
A/C on ground and engines shutdown, what are the conditions to erase the CVR recordings
？
（）
A．Press the CVR ERASE push button for 10 seconds
B．Press the GND CTL push button, make sure that parking brake is applied and press the CVR ERASE push button for 2 seconds
C．Start at least one engine and press on the GND CTL push button for 2 seconds
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