Question: Suppose the class Sub extends the class Sandwich. Which of the following assignments are legal? Sandwich x = new Sandwich(); Sub y = new Sub();

Suppose the class Sub extends the class Sandwich. Which of the following assignments are legal?

Sandwich x = new Sandwich();
Sub y = new Sub();
a. x = y;
b. y = x;
c. y = new Sandwich();
d. x = new Sub();

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