Which of these are considered Functions? A) input: student ID number, Output: number of years enrolled at a university

B) Input: number of years enrolled at a university, Output: Student iD number.

C) input: student first name, Output: Student favorite color

D) student favorite color, Output; student first name.

E) input: month of 2021, output: average profit at a fast food

Thank you! I’ve been stuck on this for awhile