Two point sources of light have an angular separation of θ, as measured by a distant observer. The light passes through a circular aperture of radius r just before reaching the observer. Which of the following conditions must be true for the two sources to be resolved?

A. $\theta  < 0.61\frac{\lambda }{r}$

B. $\theta  < 1.22\frac{\lambda }{r}$

C. $\theta  \ge 0.61\frac{\lambda }{r}$

D. $\theta  \ge 1.22\frac{\lambda }{r}$

D