In January 2022, United Airlines (UAL) had a market capitalization of $14.66 billion, debt of $30.78 billion, and cash of $18.17 billion. United Airlines had revenues of $24.21 billion. Southwest Airlines (LUV) had a market capitalization of $25.97 billion, debt of $12.11 billion, cash of $15.57 billion, and revenues of $15.59 billion. a. Compare the market capitalization-to-revenue ratio (also called the price-to-sales ratio) for United Airlines and Southwest Airlines. b. Compare the enterprise value-to-revenue ratio for United Airlines and Southwest Airlines. c. Which of these comparisons is more meaningful? Explain.