Rationalize the Denominator $D = \sqrt { L ^ { 2 } + W ^ { 2 } }$

Multiple Choice

Rationalize the denominator. Assume that all variables represent nonnegative numbers and that the denominator is not
zero.
-The length of the diagonal of a rectangle is given by $D = \sqrt { L ^ { 2 } + W ^ { 2 } }$ where L and W are the length and width of the rectangle. What is the length of the diagonal, D, of a rectangle that is 84 inches long and 60 inches wide?
Round your answer to the nearest tenth of an inch, if necessary.

A) 103.2 in.
B) 71 in.
C) 58.8 in.
D) 12 in.