Consider the standard Young’s double slit experiment setup. Let $\Delta x$ represent the path difference between the waves reaching P. Mark the correct statement(s):

 

Path difference Δx = yd/D is applicable only when D >> y 

Path difference Δx = d sin θ is applicable only when D >> d 

Almost equally spaced fringes close to C only when D >> y and d >> λ 

Total number of maxima on the screen observable is 5 when $d = 3\lambda$