Which statement concerning current is TRUE（）.<br>A:Current can be determined by measuring the direction and distance between simultaneous EP and DR positions<br>B:The drift of the current should be averaged out on a one hour basis<br>C:After the current is determined，it should not be used for further plotting because it is an unknown variable<br>D:The distance between a simultaneous DR position and fix is equal to the drift of the current

Which statement concerning current is TRUE（）.
A:Current can be determined by measuring the direction and distance between simultaneous EP and DR positions
B:The drift of the current should be averaged out on a one hour basis
C:After the current is determined，it should not be used for further plotting because it is an unknown variable
D:The distance between a simultaneous DR position and fix is equal to the drift of the current

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