Which of the Following Is an Example of a Back-Office

Which of the following is an example of a back-office activity or system?

A) A customer ordered merchandise from the enterprise's web site.
B) A purchasing agent placed an order with a supplier for equipment needed in the manufacturing plant.
C) A receiving clerk at the loading dock unloaded boxes of raw materials from a supplier's delivery truck.
D) A payroll clerk entered hours worked by each employee for last week into the information system.
E) A vice president of finance met with a bank loan officer to discuss a proposed financing agreement.