Answer:
Associative property of multiplication
Step-by-step explanation:

Associative property of multiplication is grouping of terms

Commutative property of multiplication is multiplying the terms in any order

Inverse property of multiplication states that the product of a term and its inverse is 1
the inverse of 'a' is 
Commutative property of addition is adding the terms in any order


Here the group of terms in multiplication is changes. So it represents associative property of multiplication