Add $4 \sqrt{3}+2 \sqrt{5}$ and $6 \sqrt{3}-4 \sqrt{5}$.
- A$10 \sqrt{3}-2 \sqrt{5}$
- B$10 \sqrt{3}+2 \sqrt{5}$
- C$2 \sqrt{3}-2 \sqrt{5}$
- D$10 \sqrt{3}+6 \sqrt{5}$
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