A function is different from a procedure because

a. a function does not contain a set of instructions.

b. can have only a limited number of steps.

c. returns a value.

d. is mathematical.

c. return a value

Step-by-step explanation:

Generally speaking, functions return a value, whereas procedures don't (so a procedure is just a function that doesn't return a value) ... By returns a value, we mean that the function creates some sort of results, which is passed back to the calling function.