With Regard to Priority of Claims in the Payment of Unsecured

With regard to priority of claims in the payment of unsecured debts,which of the following has priority over alimony and child support obligations?

A) costs and expenses of the administration of the bankruptcy case.
B) claims arising in the ordinary course of the debtor's business after commencement of the case
C) claims for wages,salaries or commissions earned within 180 days before the filing of the petition
D) none of the above