Select cost information for Seacrest Enterprises is as follows: 1,000 units of output 5,000 units of output Total Cost/Unit Total Cost/Unit Direct materials $5,000 $5.00 $25,000 $5.00 Utilities expense $1,000 $1.00 $3,750 $0.75 Rent expense $4,000 $4.00 $4,000 $0.80 Based on this information: Select one: a. Both direct materials and rent expense are variable costs. b. Utilities expense is a mixed cost and rent expense is a variable cost. c. Utilities expense is a mixed cost and rent expense is a fixed cost. d. Direct materials is a fixed cost and utilities expense is a mixed cost. e. Both direct materials and utilities expense are mixed costs