Answer:
Associative property
Explanation:
The given property is:
A + (B + C) = (A + B) + C
which is called "associative property of addition".
Hence, this property is used in the given expression which is "rearranging the parenthesis does not affect the result."
![\rule[225]{225}{2}](https://img.qammunity.org/2023/formulas/english/college/eq413d752mwtrwwenrzwldxt4w1olmf1b3.png)
Hope this helped!
~AH1807