Shena made a table to show the steps and algebraic properties used to write an equivalent expression for 3 x minus 5 + 7 x + 6.

Step
Expression3 x minus 5 + 7 x + 6
Property
1
3 x + 7 x + 6 minus 5
Commutative property
2
(3 x + 7 x) + (6 minus 5)
Distributive property
3
(3 + 7) x + (6 minus 5)
Distributive property
4
10 x + 1
Addition property

What error did Shena make?
Shena should have written the associative property for step 1.
Shena should have written the associative property for step 2.
Shena should have written the associative property for step 3.
Shena should have written the associative property for step 4.