Which of 40. The following is correct regarding variable cost? a. They are variable in total and fored per unit with range 2488 9418 b. They are fixed in total and fixed per unit. They are fixed in total and variable per unit 4883 a 648418 C. d. They are variable in total and variable per unit. 4883 a 64% 4883 a 648418 4883 a 648418 18