What is enterprise application integration $($EAI$)?$

A$.$ the management of information flows between and among activities in a supply chain to maximize total supply chain effectiveness and corporate profitability

B$.$ the integration of all departments and functions throughout an organization into a single IT system $($or integrated set of IT systems$)$ so employees can make decisions by viewing enterprisewide information about all business operations

C$.$ a means of managing all aspects of a customer's relationship with an organization to increase customer loyalty and retention and an organization's profitability

D$.$ information that connects the plans, methods, and tools aimed at integrating separate enterprise system