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null doubt

 
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The correct answer is D and E
..How?
 
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Those are static methods, which can be called from a reference variable, even though it's not a good idea (it leads to confusion like this). Because no instance is required to call a static method, it runs as if you were calling the static methods the "regular" way (i.e., with the class name).
 
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You're calling static methods so it doesn't matter that the instance variable is null.

If you ever catch anyone writing code like this other than for a certification exam, smite them roundly about the head and shoulders.
 
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