What Does Enterprise Resource Planning Involve

What does enterprise resource planning involve?

A) Analyzing and redesigning of workflow within and between enterprises
B) Managing information flows between and among activities in a supply chain to maximize total supply chain effectiveness and corporate profitability
C) Managing all aspects of a customer's relationship with an organization to increase customer loyalty and retention and an organization's profitability
D) Integrating all departments and functions throughout an organization into a single IT system so that employees can make decisions by viewing enterprise-wide information on all business operations