If you're getting a NullPointerException, remember that it is a perfectly valid use-case to have the constructor argument be null. What should happen in this case?

Explanation:

NullPointerException is a RuntimeException. En Java, this happens when an application try to use a reference but this is null, this is used just to create an object, because an object references cannot exist without a value, so we assign the null value to it, but no object is created and the compiler does not detect it.

For example

Object obj = null;

obj.toString();  // This statement will throw a NullPointerException

the answer will be d

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