Which of the Following Statements Is True? I

Which of the following statements is true? I.Overhead application may be made slowly as a job is worked on.
II) Overhead application may be made in a single application at the time of completion of the job.
III) Overhead application should be made to any job not completed at year-end in order to properly value the work in process inventory.

A) Only statement I is true.
B) Only statement II is true.
C) Both statements I and II are true.
D) Statements I,II,and III are all true.