Which of the following is true concerning the overhead account?

Select one:

a.

If the overhead account has a credit balance at the end of the year, overhead has been overallocated.

b.

An unexpected increase in the amount of the cost driver for overhead can cause the overhead to be underallocated.

c.

The allocation rate for overhead is calculated after all the actual overhead costs have been recorded.

d.

Actual overhead expenses are credited to the overhead account.