Which of the following are considered to be benefits of activity-based costing (ABC)?

1. More accurate product costs

2. Reduced complexity of calculating costs

3. Inclusion of non-manufacturing costs

4. More detailed understanding of what drives cost.

a. 1, 3 and 4

b. 1, 2 and 3

c. 1, 2 and 4

d. 2, 3 and 4