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જો $x + iy = \sqrt {\frac{{a + ib}}{{c + id}}} $તો ${({x^2} + {y^2})^2} = $

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