4.00 The level of inventory of a manufactured product has increased by 8,792 units during a period. The following data are also available: Variable Fixed Unit manufacturing costs of the period $10.00 $8.00 Unit operating expenses of the period 2.00 The effect on operating income if absorption costing is used rather than variable costing would be a O a. S105.504 decrease Ob. 570.536 increase Oc 570,336 decrease Od: 5105504 increase