Question: Assigning a subclass reference to a superclass variable is safe: Group of answer choices because the subclass object has an object of its superclass. because

Assigning a subclass reference to a superclass variable is safe:
Group of answer choices
because the subclass object has an object of its superclass.
because the subclass object is an object of its superclass.
only when the superclass is abstract.
only when the superclass is concrete.

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