试述普雷特行为矩阵的分析方法与主要结论

How can the SART’s audible tone monitor be used?（）

A.It informs survivors that assistance may be nearby

B.It informs survivors when the battery's charge condition has weakened

C.It informs survivors when the SART switches to the standby mode

D.It informs survivors that a nearby vessel is signaling on DSC