Question 1 5 pts An activity-based costing system that is designed as described in our text will not conform to generally accepted accounting principles because: O under this activity-based costing system, product costs exclude some manufacturing costs and include some nonmanufacturing costs. e under activity-based costing manufacturing costs are assigned to products. o activity-based costing has not been approved by the United Nation's International Accounting Board. activity-based costing results in less accurate costs than more traditional costing methods based on direct labor-hours or machine-hours