Which of the following statements is/are true? Select one: a. When managers intentionally set budgeted costs too low and budgeted revenues too high, they are creating budgetary slack b. One disadvantage of participative budgeting is employees' tendency to overestimate of expenses or an underestimate of revenues. c. In a production budget, beginning inventory in units plus budgeted units to be produced equals unit sales minus targeted ending inventory in units. d. All of the given statements are true e Production and inventory budgets form the basis for developing the sales budget