What occurs when you call a method on a reference variable that contains null? select one: a. an error b. an arithmeticexception error c. a nullpointerexception error d. a classcastexception error

Option(c) i.e "A NullPointerException error " is the correct answer for the given question.

Explanation:

Exception are the run time error in the program.A NullPointerException is the runtime error when the pointer containing the NULL value .This type of exception occur when we call that function on the pointer variable which contains the NULL.

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