Which of the following assignments will compile without

Question

Which of the following assignments will compile without errors? Explain your answers.

(a) RoundBalloon b1 = new RoundBalloon();

(b) Balloon b2 = new RoundBalloon(100, 100, 10, Color.RED);

(c) Balloon b3 = new SquareBalloon();

(d) RoundBalloon b5 = new Balloon();