【单选题】

in project-driven companies, costs are usually billed againest the project based upon:

a. the burdened labor rate of the actual employees who performed the work.
b. the burdened labor rate of the line organization average salary.
c. the burdened labor rate of the company average salary.
d. the burdened labor rate of the average salary of the project team members.
e. none of the above.