Java OCA OCP Practice Question 1676

public class Main {
 static void compute(int... is) {                             // (1)
   System.out.print("|");
   for(int i : is) {
     System.out.print(i + "|");
   }/*from w w  w  .  j  a va 2  s  . c o  m*/
   System.out.println();
 }
 static void compute(int[] ia, int... is) {                   // (2)
   compute(ia);
   compute(is);
 }
 static void compute(int[] inta, int[]... is) {               // (3)
   for(int[] ia : is) {
     compute(ia);
   }
 }
 public static void main(String[] args) {
   compute(new int[] {90, 99}, new int[] {92, 93, 94});       // (4)
   compute(95, 96);                                           // (5)
   compute(new int[] {97, 98}, new int[][] {{89}, {20}});     // (6)
   compute(null, new int[][] {{21}, {22}});                   // (7)
 }
}

(a) The program does not compile because of errors in one or more calls to the compute() method.
(b) The program compiles, but throws a NullPointerException when run.
(c) The program compiles and prints:// w  ww.  java 2 s  .c om
    |90|99|
    |92|93|94|
    |95|96|
    |89|
    |20|
    |21|
    |22|
(d) The program compiles and prints:
    |92|93|94|
    |95|96|
    |90|99|
    |89|
    |20|
    |21|
    |22|