Chapter 18.9, Problem 18.9.1CP

Which of the following statements are true?

1. a. Any recursive method can be converted into a nonrecursive method.
2. b. Recursive methods take more time and memory to execute than nonrecursive methods.
3. c. Recursive methods are always simpler than nonrecursive methods.
4. d. There is always a selection statement in a recursive method to check whether a base case is reached.