Below is budgeted production and sales information for Flushing Company for the month of December: Product XXX Product ZZZ Estimated beginning inventory 29,000 units 16,800 units Desired ending inventory 36,500 units 15,000 units Region I, anticipated sales 350,000 units 265,000 units Region II, anticipated sales 194,000 units 147,000 units The unit selling price for product XXX is $4 and for product ZZZ is $13. Budgeted production for product XXX during the month is Oa. 551,500 units Ob. 544,000 units c. 536,500 units Od. 580,500 units