I Have a Caffeine Migraine Corporation (HCM, Co.) manufacturers caffeine tablets. A handful of their expenses have been summarized below at three different volume levels. Total Costs Total Costs Total Costs Volume 1,000 units 2,000 units 3,000 units Expense 1 $5,000 $10,000 $15,000 Expense 2 $6,000 $8,000 $9,500 Expense 3 $15,000 $15,000 $15,000 Expense 4 $10,000 $10,000 $12,000 What is the behavior of Expense 1? The following information is used for questions 1 - 4 I Have a Caffeine Migraine Corporation (HCM, Co.) manufacturers caffeine tablets. A handful of their expenses have been summarized below at three different volume levels. Total Costs Total Costs Total Costs Volume 1,000 units 2,000 units 3,000 units Expense 1 $5,000 $10,000 $15,000 Expense 2 $6,000 $8,000 $9,500 Expense 3 $15,000 $15,000 $15,000 Expense 4 $10,000 $10,000 $12,000 What is the behavior of Expense 1? Step-cost Mixed cost Variable cost Fixed cost