A nucleus decays by ${\beta ^ + }$ emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are $Z$ and $A$ respectively, the corresponding numbers for the daughter nucleus are respectively.

  • A

    $Z - 1$ and $A - 1$

  • B

    $Z + 1$ and $A$

  • C

    $Z - 1$ and $A$

  • D

    $Z + 1$ and $A - 1$

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