If $A = \{x, y\}$ then the power set of $A$ is

  • A

    $\{ {x^x},\,{y^y}\} $

  • B

    $\{ \phi,x, y\}$

  • C

    $\{\phi, {x}, {2y}\}$

  • D

    $\{\phi, x, y, \{ x, y \} \}$

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