Only subqestion 2, please

Question2 Consider the following program: class Q2 public static void main (Stringl args)f System.out.println (f (20)); static long f(long n)t if (n== 0) else if (n-= 1) else return 0; return 1; return f (n/2) f (n/2); 1. What is the output of the program? 2. Depict the calls on the run-time stack when f (1) is encountered for the first time