Four statements are given ( A is mass number): A. The volume of a nucleus is proportional to A 1/3 . B. The volume of a nucleus is proportional to A . C. The difference in mass of an atom and its nucleus is called the mass defect. D. The difference in mass of a nucleus and its constituents is called the mass defect. Choose the correct answer from the options given below:

1. A. A and D are true, but B and C are false
2. B. B and D are true, but A and C are false
3. C. B and C are true, but A and D are false
4. D. A and C are true, but B and D are false

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