$m_{p}$ and $m_{n}$ are the masses of a proton and a neutron, respectively. For an element of mass $M$ having $Z$ protons and $N$ neutrons, which of the following is true?
- A$M > Z m_{p} + N m_{n}$
- B$M = Z m_{p} + N m_{n}$
- C$M < Z m_{p} + N m_{n}$
- D$M$ may be greater than, less than, or equal to $Z m_{p} + N m_{n}$, depending on the nature of the element.
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