જો $x + iy = \sqrt{\frac{a + ib}{c + id}}$ હોય,તો $(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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