The Collimator Limits the Size and Shape of the X-Ray $\frac {3} {4}$

The collimator limits the size and shape of the x-ray beam to no more than:

A) one inch at the skin
B) 2 $\frac {3} {4}$ inches at the skin
C) 3 $\frac {1} {2}$ inches at the skin
D) 5 inches at the skin