Which of the following is not true of activity-based costing (ABC)?

		If overhead costs are of a big amount, ABC can provide benefits in computing accurate product costs.
		ABC is beneficial, if the costs of many activities are directly related to production units.
		For direct manufacturing costs, there is no difference between traditional costing and ABC.
		Unlike traditional costing, ABC uses multiple bases in applying overhead.
		If a company makes a single product, ABC is no better than traditional costing.