Answer:
1. b. fixed costs.
2. d. fixed factory overhead.
3. c. mixed costs.
Step-by-step explanation:
Costs are usually classified as fixed and variable cost. Fixed cost are cost that don not vary with the level of activities (usually expressed as units of production or sales) of an organization.
Variable cost on the other hand are cost that varies with the level of activity. A combination of these cost is called mixed cost.
Under variable costing, all cost are dependent on activity level hence are not fixed.