Which three can be included in an interface declaration?

Which three can be included in an interface declaration? (Choose three.)

A.
protected void showMessage();

B.
void showMessage();

C.
abstract void showMessage();

D.
private void showMessage();

E.
public void showMessage() {
System.out.println(“Hello.”);
}

F.
public void showMessage();

G.
static void showMessage();