Homer's Holesome Donuts has determined that its profit-maximizing quantity is 10,000 donuts per year. Homer's earns $12,000 in revenue from the sale of those donuts. Homer's has two costs. First he pays $16,000 in annual rental payments for its five-year lease on its store. Second Homer incurs an additional cost of $5,000 for ingredients. Homer's fixed cost is equal to Select one: O a. $5,000 O b. 516,000 O c. $21,000 O d.o