A nucleus $X$ undergoes following transformation

$X \stackrel{a}{\longrightarrow} Y$

$Y \underset{2 \beta}{\longrightarrow} Z$

then

  • A

    $X$ and $Y$ are isotopes

  • B

    $X$ and $Z$ are isobars

  • C

    $X$ and $Y$ are isobars

  • D

    $X$ and $Z$ are isotopes

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