(Choose 1 answer)
What is the output of this program?
1.class Box {
2.
int a;
3.int b;
4.
5. }
int c;
6.class Mainclass {
7.
public static void main(String args[])
8.{
9.Box x = new Box();
10.11.Box y;x.a = 2;
12.x.b = 4;
13.x.c = 1;
14.y = x;
15.System.out.println(y.a);
16.}
17. }
A. 2
B. 4
C. Runtime error
D. Compile error
