Jonah Is One of the Payroll Accountants in a Company

Jonah is one of the payroll accountants in a company that specializes in custom work for each customer. His biggest payroll challenge is accurate allocation of labor to jobs. Which of the following represents the most accurate option to track the company's labor costs?

A) Handwritten time slips on which the employee documents the times worked on each job.
B) Verbal reporting via telephone of time worked per job.
C) Computer log-ins when employees change tasks.
D) Radio-frequency time cards to track time allocations.