A box without a top is made from a rectangular piece of cardboard, with dimensions 25 inches by 20 inches, by cutting out square corners with side length x inches.
Which expression represents the volume of the box in terms of x?
a.(25−2x)(20−2x)x(25−2x)(20−2x)x
b.(2x−25)(2x−20)x(2x−25)(2x−20)x
c.(25−2x)(20−2x)4x(25−2x)(20−2x)4x
d.(25−x)(20−x)x
