In a standard `YDSE` apparatus a time film `(mu=1.5,t=2.1mum)` is placed in front of upper slit.How far above or below the center point of the screen are two nearest maximum located? Take `D=1m,d=1mm,lambda=4500Å`.(Symbols have usual meaning).
A. `1.5mm`
B. `0.6mm`
C. `0.15mm`
D. `0.3mm`