When solving the equation 4(3x^2 +2)-9=8x^2+7. Emily wrote 4(3x + 2)=8x^2 + 16 as her first step. Which property justifies Emily's first step? State a reason why

1) Addition Property of Equality

2)Commutative Property of Addition

3) Multiplication Property of Equality

4) Distributive Property of Multiplication Over Addition