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) (n lambda)/(d)`
B. `cos^(-1)(4lambda)/(d)`
C. `tan^(-1)(d)/(4lambda)`
D. `cos^(-1)(lambda)/(4d)`
