All of the following are necessary for budgets to be effective except. Select one: a. Goals should be challenging but attainable. o b. All levels of management from all departments with an organization should be involved in the budgeting process. O c. Employees who will have performance evaluated according to the budget standards should not be involved in preparing the budget. O d. Evaluations should be made carefully with opportunities to explain differences between actual and budgeted amounts. O e. Managers should be aware of potential negative outcomes of budgeting, such as budgetary slack