A nucleus A Z X has mass represented by M(A, Z). If M p and M n denote the mass of proton and neutron respectively and B.E. the binding energy in MeV, then

1. A. B.E. = [ZM p + (A-Z)M n - M(A, Z)]c 2
2. B. B.E. = [ZM p + ZM n - M(A, Z)]c 2
3. C. B.E. = M(A, Z) - ZM p - (A-Z)M n
4. D. B.E. = [M(A, Z) - ZM p - (A-Z)M n]c 2

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