Let $S$ be a set containing n elements and we select $2$ subsets $A$ and $B$ of $S$ at random then the probability that $A \cup B = S$ and $A \cap B = \phi $ is

  • A

    ${2^n}$

  • B

    ${n^2}$

  • C

    $1/n$

  • D

    $1/{2^n}$

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