An object is identified by its
characteristics
state
class
attribute

Characteristics is the correct answer to the given question .

Explanation:

The main objective of object is for accessing the member of class .When we have to access the member of class we can create the object of that class The object  is is identified by there characteristics.The characteristics describe the behavior and state of a class.

With the help of class and object we can implement the real world concept .The object is the run time entity of a class where as the class is physical entity .Without the object we can not implemented the object oriented programming.All the other option are not correct for the object because they are not described the identification of object .

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The answer for your specific question is d.