An abstract class Dwelling has two subclasses, SingleFamily and MultiFamily. None of the constructors for these classes

Question:

An abstract class Dwelling has two subclasses, SingleFamily and MultiFamily. None of the constructors for these classes requires any arguments. Which of the following statements is legal?
a. Dwelling myHome = new Dwelling();
b. SingleFamily myHome = new SingleFamily();
c. MultiFamily myHome = new Dwelling();
d. Two of the above

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