Which of the following statements about a flexible budget is most correct? a. A flexible budget uses realized (actual) prices along with all other original (simple) budget assumptions. b. A flexible budget uses realized (actual) labor costs along with all other original (simple) budget assumptions. c. A flexible budget uses realized (actual) supplies costs along with all other original (simple) budget assumptions. d. A flexible budget uses realized (actual) facilities costs along with all other original (simple) budget assumptions. e. A flexible budget uses realized (actual) volume along with all other original (simple) budget assumptions