Which two, independently, will allow Sub to compile?

Given:

1. class Super {
2. private int a;
3. protected Super(int a) { this.a = a; }
4. } …
11. class Sub extends Super {
12. public Sub(int a) { super(a); }
13. public Sub() { this.a = 5; }
14. }

Which two, independently, will allow Sub to compile? (Choose two.)

A.
Change line 2 to:
public int a;

B.
Change line 2 to:
protected int a;

C.
Change line 13 to:
public Sub() { this(5); }

D.
Change line 13 to:
public Sub() { super(5); }

E.
Change line 13 to:
public Sub() { super(a); }