Given that ` y =A sin [( ( 2pi )/( lambda ) ( ct -x))] ` ,where y and x are measured in metres. Which of the following statement is true?
A. The unit of ` lambda ^(-1)` is same as that of `( 2pi )/( lambda ) `
B. The unit of `lambda ` is same as that of x but not of A
C. The unit of c is same as that of ` ( 2pi)/( lambda) `
D. The unit of (ct-x) is same as that of ` ( 2pi)/( lambda) `
