Two coherent sources separated by distance d are radiating in phase having wavelength `lambda`. A detector moves in a big circle around the two sources in the plane of the two sources. The angular position of `n=4` interference maxima is given as
A. `"sin"^(-1) (nlambda)/d`
B. `"cos"^(-1) (4lambda)/d`
C. `"tan"^(-1)d/(4lambda)`
D. `"cos"^(-1)lambda/(4d)`