Which computer application is most directly associated with automating the procure-to-pay cycle in an organization?

An ERP system (like SAP, Oracle) integrates all business processes. Its modules for Materials Management and Finance work together to automate the entire procure-to-pay cycle: purchase requisition -> purchase order -> goods receipt -> invoice verification -> payment to vendor. While SCM (D) software manages the broader supply chain, ERP provides the core transactional and financial integration for the P2P process within the organization. CRM (B) manages customer interactions, HRMS (A) manages employees, and BI (E) is for data analysis.