Having a reference allows all of the above given statements.
Answer: Option D
Explanation:
When some one has a reference for something, it allows the person to refer to the method in an explicit manner and also allows to refer to the method in an explicit manner.
The reference can be used to take in to the considerations the variables and the other methods of the object related to the calling of that particular method. It can also be used to refer to the object also. All of these can be referred to when a reference is given.