a. What was McDonald's largest operating expense for 2019? Did this operating expense increase or decrease as a proportion of total revenues between 2019 and 2018? b. What was the net amount of PP&E owned by McDonald's in 2019? What was the amount of PP&E's cost that was allocated as an expense for 2019? What was the total amount of PP&E's cost related to assets reported on the balance sheet that had been allocated as an expense until the end of 2019? c. McDonald's buys and sells restaurant businesses with its franchisees to achieve an optimal ownership mix of its restaurants in each market. What were the total proceeds from the sales of restaurant businesses in 2019? And, how much was the gain or loss on the sales of restaurant businesses? d. What was McDonald's income tax expense for 2019? Did the income tax expense for 2019 differ from the amount of taxes paid in 2019? If yes, by how much? e. Which account on McDonald's financial statements measures the amount of cash McDonald's has paid in advance for future expenses? What was the change in this account during 2019? f. What was McDonald's total long-term debt obligation in 2019? How much of this amount was to become due in 2020?