A rectangular shipping crate, like the figure shown, has a diagonal measurement from the lower back corner to the upper front corner of 52 in. If the longest side is 4 times the shortest side (the height) and the third side is 4 longer than the shortest, and the height is x, what is a function to represent the volume of the crate?
A. 4x²(x+4)
B. x²(4x+16)
C. 4x²(x-4)
D. 4x²(4-x)