Write down the power set of $C = \{1, \{2\}\}$.

  • A
    $\{\phi, \{1\}, \{\{2\}\}\}$
  • B
    $\{\phi, \{1\}, \{\{2\}\}, \{1, \{2\}\}\}$
  • C
    $\{\{1\}, \{\{2\}\}, \{1, \{2\}\}\}$
  • D
    None of these

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