Answer:
The correct option is 4. The given equation illustrates the Associative Property of Addition.
Explanation:
Te given equation is

According to the Associative Property of Addition then order of addition does not affect the resultant, if a,b,c are three numbers then a+(b+c) and (a+b)+c are equivalent expression.

The given equation illustrates the Associative Property of Addition.
Therefore the correct option is 4.