Erwin Plumbing Materials Company has a sales office that sells water pipes to construction companies. The sales office is a revenue center and prepares a monthly responsibility report . The partially completed responsibility report is provided. U/F Revenue Center Responsibility Report Actual Flexible Sales Product Sales Budget Flexible Volume Static Type Revenue Variance U/F Budget Variance Budget 40 inch $31,700 $30,500 $40,800 36 inch long 40,000 42,000 33,000 36 inch short 36,200 33,000 31,000 32 inch 19,100 20,000 28,400 The company uses management by exception to address flexible budget variances. On which product type would the company first focus? A. 32 inch OB 36 inch short O c. 36 inch long D. 40 inch