When a nucleus with atomic number $Z$ and mass number $A$ undergoes a radioactive decay process :

  • A

    both $Z$ and $A$ will decrease, if the process is $\alpha$ decay

  • B

    $Z$ will decrease but $A$ will not change, if the process is $\beta ^+$ decay

  • C

    $Z$ and $A$ will remain unchanged, if the process is $\gamma$ decay.

  • D

    all of the above

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