यदि $x + iy = \sqrt{\frac{a + ib}{c + id}}$ है,तो $(x^2 + y^2)^2 = $

  • A
    $\frac{a^2 + b^2}{c^2 + d^2}$
  • B
    $\frac{a + b}{c + d}$
  • C
    $\frac{c^2 + d^2}{a^2 + b^2}$
  • D
    $\left(\frac{a^2 + b^2}{c^2 + d^2}\right)^2$

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