please just write the correct letter for 6-10

6. A cost unit that consists of a group of identical items and maintains its identity throughout one or more stages of production is a a) job b) batch c) process d) unit of product 7. One feature of job costing is that the job a) is completed within a minimum period of one year b) should be one involving the construction of a bridge C) is identifiable throughout the various stages of production d) should always involve masons, carpenters and architects 8. Semi-fixed costs a) vary directly with changes in the level of output b) do not change at all no matter the level of output c) change with output but not in the same proportion d) do not change in future but may change immediately 9. Opportunity costs a) are forgone costs b) are paid for like other costs C) give options for decision making d) give opportunities for increasing cost 10. Which of the following is correct? To find the production cost of an item a) indirect wages should be excluded b) cost of packaging should be included C) maintenance cost should be excluded d) selling and distribution cost should be included