The expression 12(x + 4) represents the total cost of CDs Mei bought in April and May at $12 each. Which property is applied to write the equivalent expression 12x + 48?
A- Associative Property of Addition
B- Associative Property of Multiplication
C- Commutative Property of Multiplication
D- Distributive Property
A- Associative Property of Addition
B- Associative Property of Multiplication
C- Commutative Property of Multiplication
D- Distributive Property