please give me correct answer with brief explaintion

IZBOT is a small start-up organization providing speech recognition technology for installation into the cockpits of small aircraft. The speech recognition is integrated into the GPS navigation system. Because of the complex technology involved, many components are purchased from outside suppliers, with final integration of technologies and assembly taking place at the IZBOT location. The organization has gotten bogged down in the entire order process, however, with purchase orders taking too long to be approved and invoices languishing unpaid. The organization wishes to see how technology can provide a more timely solution to these issues. Which of the following seems to be a likely solution for them to implement? a) Electronic Data Interchange (EDI) b) Reverse auction c) Enterprise Resource Planning (ERP) d) Purchase order system