The equation $z\overline{z} + a\overline{z} + \overline{a}z + b = 0$,where $b \in \mathbb{R}$,represents a circle if

  • A
    $|a|^2 = b$
  • B
    $|a|^2 > b$
  • C
    $|a|^2 < b$
  • D
    None of these

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