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assume the following source code appears in a syntactically correct java class. which instance variable below stores a reference? private int green; private boolean orange; private char blue; private double red; private string purple;

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Class-level instance variables can be declared either before or after they are used. The correct answer is B.  

An instance variable is a variable that is specific to an object. It is listed inside the curly braces of the class, outside of any methods. The value of an instance variable is accessible to all methods of the class, but is not accessible from outside the class. Non-static variables defined outside methods, constructors, or class blocks are known as instance variables in Java. In each instance of the class that is created, this variable exists separately. An instance variable belongs to a class.

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