If the Overhead Control Account Has a Credit Balance at the End

If the overhead control account has a credit balance at the end of the period, then:

A) overhead is underapplied and the difference should be credited to the proper accounts
B) overhead is overapplied and the difference should be credited to the proper accounts
C) overhead is overapplied and the difference should be debited to the proper accounts
D) overhead is underapplied and the difference should be debited to the proper accounts