MCQ
$\begin{array}{l}\text { If }(a+i b)(c+i d)(e+i f)(g+i h)=A+i B \text {, then } \\ \left(a^2+b^2\right)\left(c^2+d^2\right)\left(e^2+f^2\right)\left(g^2+h^2\right)=\end{array}$
- ✓$A^2+B^2$
- B$A^2-B^2$
- C$A ^2$
- D$B ^2$
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