The area of a rectangle with dimensions "a" by "b" is given by the following:
[tex]area=a\cdot b[/tex]While the perimeter is given by:
[tex]perimeter=2\cdot a+2\cdot b[/tex]With this in mind we can see that:
"A" represents the area.
"B" represents neither.
"C" represents neither.
"D" represents the perimeter.