$A$ nucleus $^{A}_{Z} X$ has mass represented by $M(A, Z)$. If $M_p$ and $M_n$ denote the mass of a proton and a neutron respectively, and $B.E.$ is the binding energy in $MeV$, then:
- A$B.E. = [Z M_p + (A - Z) M_n - M(A, Z)] c^2$
- B$B.E. = [Z M_p + A M_n - M(A, Z)] c^2$
- C$B.E. = M(A, Z) - Z M_p - (A - Z) M_n$
- D$B.E. = [M(A, Z) - Z M_p - (A - Z) M_n] c^2$
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