A programmer notices the following two procedures in a library. The procedures do similar, but not identical, things.

Procedure square (n) returns the value n2

Procedure cube (n) returns the value n3

Which of the following procedures is a generalization of the procedures described above?
A. Procedure Add (n, m), which returns the value n + m
B. Procedure Fourth (n), which returns the value n4
C. Procedure Polynomial(n), which returns the value n3 +n2
D. Procedure Power (n, m), which returns the value nm