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Two identical nuclei \( A \) and \( B \) of the same radioactive element undergo \( \beta \) decay. A emits a \( \beta \)-particle and changes to
\( \mathrm{P} \) \( A^{\prime} . B \) emits a \( \beta \)-particle and then a \( \gamma \)-ray photon immediately

W afterwards, and changes to \( B^{\prime} \) :
(A) \( A^{\prime} \) and \( B^{\prime} \) have the same atomic number and mass number.
(B) \( A^{\prime} \) and \( B^{\prime} \) have the same atomic number but different mass numbers
(C) \( A^{\prime} \) and \( B^{\prime} \) have different atomic numbers but the same mass number
(D) \( A^{\prime} \) and \( B^{\prime} \) are isotopes.
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