If (a+ib)(c+id)(e+if)(g+ih) = A+iB, then...

If `(a+ib)(c+id)(e+if)(g+ih) = A+iB`, then `(a^2+b^2)(c^2+d^2)(e^2+f^2)(g^2+h^2) = `

A

A)`A^2+B^2`

B

B)`A^2-B^2`

C

C)`A^2`

D

D)`B^2`

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