The total cost for monthly depreciation cost in a factory is $10,000 irrespective of the quantity of output achieved. This cost is: O a. strictly fixed. Ob. astep cost. Oc. a mixed cost O d. strictly variable Which of the following is true of a mixed cost? Oa. It does not change with a change in the level of output. Ob. It contains both a fixed and a variable component. Oc. It cannot be separated into fixed and variable components. O d. All of these choices are correct