The level of inventory of a manufactured product has increased by 6,964 units during a period. The following data are also available: Variable Unit manufacturing costs of the period Unit operating expenses of the period Fixed $14.00 $7.00 1.00 4.00 The effect on operating income if absorption costing is used rather than variable costing would be a Oa. $76,604 increase Ob. $48,748 increase Oc. $76,604 decrease Od. $48,748 decrease