If (x//y) = (z//w), then what is (xy + z...

If `(x//y) = (z//w),` then what is `(xy + zw)^2` equal to ?

A

`(x^2 + z^2) (y^2 + w^2)`

B

`x^2y^2 + z^2w^2`

C

`x^2w^2 + y^2z`

D

`(x^2 + w^2) (y^2 + z^2)`

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