Apex Office Solutions sells its printers for office use. The printers sell for $72 per unit. Variable costs are $15.25 per unit. Total fixed costs are $98,000 per month for volumes up to 4,500 units. Above 4,500 units, total monthly fixed costs are $125,000. Using flexible budgets, find operating income at a volume level of 3,500 units. O A. $157,375 OB. $324,000 C. $100,625 D. $252,000