Which of the following statements is incorrect concerning activity-based costing? ABC may be used with either a job order or process cost accounting system. ABC assumes all costs related to the...

Which of the following statements is incorrect concerning activity-based costing?

1. ABC may be used with either a job order or process cost accounting system.


2. ABC assumes all costs related to the activity should respond proportionally to changes in the activity level of the cost driver.


3. The primary benefit of ABC is more accurate and meaningful product costing.


4. ABC focuses on units of production.