下面运算符的运算顺序正确的是( )。

A．+，-，≤，*，/

B．*，/，∧，＋，-，≥

C．∧，*，/，-，+，≤

D．≥，+,-,*,/,∧

When your vessel is proceeding to the area of traffic density，（）is used to determine the exact ranges of other ships or objects in the vicinity.

A.Radar

B.GPS

C.DF

D.Satellite Navigator