The method of distributing service department costs to production departments which makes no attempt to determine the extent to which one service department renders its services to another department is the

Direct distribution method.

Explanation:

It is known that naturally, direct distribution channel is organized and managed singly and directly by the manufacturer himself. But in the case that is discussed above, is a case of direct service distribution where their is no alteration or attempts in finding out how the department work and knowing their service rendering capacity can be easily tagged direct distribution method. In certain cases where indirect distribution is seen or involved; third parties are been involved therefore presence of warehouses, wholesalers, and retailers are been put to condideration.