Question: A variable declared to be of one class can later reference an extended class of that class. This variable is known as Group of answer

A variable declared to be of one class can later reference an extended class of that class. This variable is known as
Group of answer choices
protected
derivable
cloneable
polymorphic
none of the above, a variable declared to be of one class can never reference any other type of class, even an extended class

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