Which of the following is not true?
A、A by product is a product produced at eh sames time as other products which has a relatively low volume compared with the other products.
B、Since a by product is a saleable item it should be separately costed in the process account, and should absorb some of the process costs.
C、Costs incurred prior to the point of separation are known as the common or joint costs.
D、The relative sales value method is the most widely used method of apportioning joint costs.