Which two modifications enable the code to compile?

Given:
1. abstract class Shape {
2. Shape ( ) { System.out.println (“Shape”); }
3. protected void area ( ) { System.out.println (“Shape”); }
4. }
5.
6. class Square extends Shape {
7. int side;
8. Square int side {
9. /* insert code here */
10. this.side = side;
11. }
12. public void area ( ) { System.out.println (“Square”); }
13. }
14. class Rectangle extends Square {
15. int len, br;16. Rectangle (int x, int y) {
17. /* insert code here */
18. len = x, br = y;
19. }
20. void area ( ) { System.out.println (“Rectangle”); }
21. }
Which two modifications enable the code to compile?

A.
At line 1, remove abstract

B.
At line 9, insert super ( );

C.
At line 12, remove public

D.
At line 17, insert super (x);

E.
At line 17, insert super (); super.side = x;

F.
At line 20, use public void area ( ) {