Which of the Following Is not a Difference Between Job

Which of the following is not a difference between job costing for service firms and job costing for manufacturing companies?

A) Service firms generally use fewer direct materials than manufacturing companies.
B) Service firms' overhead accounts have slightly different titles (e.g. ,Applied Service Overhead) .
C) Service firms' finished jobs are charged to Cost of Services Billed instead of Cost of Goods Sold.
D) Service firms' costs are immediately expensed since all work is completed during a perioD.
Not all service jobs are completed in a perioD.
There may very well be a work-in-process.