Assigning a subclass reference to a superclass variable is safe ________.
a. because the subclass object has an object of its superclass.
b. because the subclass object is an object of its superclass.
c. only when the superclass is abstract.
d. only when the superclass is concrete.
b. because the subclass object is an object of its superclass.
Computer Science & Information Technology
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Computer Science & Information Technology
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Computer Science & Information Technology