What is printed by this code (enter a number only)? public class IntHolder { public int i; 123 2 3 4 5 6 7 8 9 10 | 11 12 13 14 15 16 17 18 19 20 ...public IntHolder(int i) { this.i = 1; } ....//.Demonstrate the class public static void main(String[] args) { ...IntHolder intHolder = new IntHolder (4); C.add2 (intHolder); System.out.println(intHolder. i); .... ...} } class C { ***.static void add2 (IntHolder intHolder) { ........ intHolder.i. += 2; } } A