Which of the following statements are correct?
a. A reference variable is an object.
b. A reference variable references to an object.
c. A data field in a class must be of a primitive type.
d. A data field in a class can be of an object type.
b. A reference variable references to an object.
d. A data field in a class can be of an object type.
(a) is wrong because a reference variable is not an object, it is a reference that points to an object. (c) is incorrect because a class may have a data field of an object type such as String.
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