1. ${\left(4a-8b\right)}^2-{\left(3a-9b\right)}^3-3\left(a+b\right)\left(4a+8b\right)\left(3a-9b\right)$

• A. ${\left(a-b\right)}^3$
• B. ${\left(a-b\right)}^3$
• C. ${\left(a-b\right)}^3$
• D. ${\left(a-b\right)}^3$

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