In special order$$ situations, unit costs are useful for predicting total$\_\_\_\_\_\_\_\_.$ In special order$$ situations, unit costs are not useful for predicting total$\_\_\_\_\_\_\_\_.$

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Part $1$

A$.$

fixed$$ costs; variable costs

B$.$

mixed$$ costs; step costs

C$.$

variable$$ costs; fixed costs

D$.$

step$$ costs; mixed costs