What property is shown by the equation?

Column A

1.

(–22 + 17) + 13 = –22 + (17 + 13)

2.

–(27 + (–3)) = –27 + 3

3.

35 + (–15 + 4) = (35 + (–15)) + 4

4.

–12 + 6 = 6 + (–12)

column B

Acommutative property

Bassociative property

Copposite of a sum property