Java Problem public class Q1Fib { /**  * This function takes a positive integer, n, and returns the corresponding Fibonacci  * number, fib(N), where  * fib(0) = 0,  * fib(1) = 1, and  * fib(N) = fib(N-1) + fib(N-2) for all N > 1.  *  * for example:  * if n = 1 the result will be 1, and  * if n = 3 the result will be 2 because 2 = 1 + 1, and  * if n = 5 the result will be 5 because 5 = 3 + 2  */  public static int fib(int n) { return -1; // FIXME Question 1ii: complete this function  } }