Which one is a fault in the following program? public int findLast (int[] x, int y) //Effects: If x==null throw NullPointerException // else return the index of the last element // in x that equals y. // If no such element exists, return -1 for (int i=x.length-1; i > 0; i--) { if (x[i] == y) { } return i } return -1; // test: x-[2, 3, 5]; y = 2 // Expected = 0