Which of the following statements about writing functions and top-down design is not true? a. writing functions manage complexity in a program. b. top-down design leads to programs which feature multiple layers of abstraction. c. two programmers solving the same problem using top-down design should arrive at identical programs. d. top-down design relies upon identifying sub-problems of a larger problem. e. top-down design assists in identifying the layers of functions that will be used to solve a programming problem.