17. The following diagram represents a cost behavior pattern: Total Cost 0 Volume of activity Which of the following statements is consistent with the above diagram? A. Annual factory costs when the electricity supplier sets a tariff based on a fixed charge plus a constant unit cost for consumption but subject to a maximum annual charge B. Weekly total labor cost when workers are paid an hourly wage during normal working hours and a higher hourly rate if they are required to work outside those hours C. Total direct material cost for a period if the supplier charges a lower unit cost on all units once a certain quantity has been purchased in that period D. Total direct material cost for a period if the supplier has agreed to a maximum charge for that period