Russo Corporation manufactured 17,000 air conditioners during November. The overhead cost-allocation base is $35.75 per machine - hour. The following variable overhead data pertain to November: Production Machine - hours Variable overhead cost per machine-hour Actual 17,000 units 8,425 hours $35.00 Budgeted 19,000 units 9,500 hours $35.75 What is the total variable overhead variance? O A. $2,681.25 favorable OB. $2,681.25 unfavorable OC. $9,000.00 favorable OD. $9,000.00 unfavorable