preg 13) Which of the following best describes the behavior of a variable cost? a. In total, it varies directly and proportionally with changes in activity level, but remains constant per unit, within the relevant range of activity. b. The company itself decides how it will define the behavior of the variable cost. c. In total it remains constant but unitarily it varies directly and proportionally with the changes in activity level, within the pertinent band of activity. d. It is associated with the cost of rent, depreciation, property taxes.