In Meselson and Stahl's experiments, heavy $DNA$ was distinguished from normal $DNA$ by centrifugation in

  • A

    $CsOH \;gradient$

  • B

    $14 \mathrm{NH} 4 \mathrm{Cl}$

  • C

    $15 \mathrm{NH} 4 \mathrm{Cl}$

  • D

    $CsCl\; gradient$

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