The cost of materials used on a specific job is first captured on which source document? Select one: O a. Cost driver sheet O b. Labor time ticket O c Process cost sheet O d. Materials requisition form Which one of the following is correct about variable costing systems? Select one: O a. Calculate product cost as the sum of directs materials, direct labor, manufacturing overhead costs, and selling cost O b. Normally result into a lower product cost compared to absorption costing systems O c. Calculate product cost as the sum of directs materials, direct labor and manufacturing overhead costs O d. Focuses on both variable and fixed costs