A Supplier Disputes a Low Rating Generated by a Company's

A supplier disputes a low rating generated by a company's enterprise resources planning (ERP) system. Which of the following actions by the purchasing agent is most appropriate?

A) Advise the ERP information technology manager that there is a flaw in the rating system.
B) Scrap the vendor rating system until the company can figure out what is wrong.
C) Compare the vendor and company detail records, and interview company employees who handled the data.
D) Tell the supplier that, regardless of the disputed claims, the supplier must improve performance.