How does crossing-over result in genetic recombination?

A-It mixes half the maternal chromosomes with half the paternal chromosomes.
B- It randomly separates the maternal and paternal chromosomes.
C- It reduces the original cell’s chromosome number by half.
D- It permits the exchange of genetic material between maternal and paternal chromosomes.

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  1. It's not B nor C. So, explain why it might be A or D.

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