Which of the following shows correct pairing of a property of operations and its example.

Is it 2(a+3)=2a+6 ; commutative property or
Is it 2(a+3)=2a+6; Associative property or
Is it 2a+3b=3b+2a ;commutative property or
Is it 2a+3b=3b+2a distributive property

The correct pairing is:

2(a+3)=2a+6; Distributive property