What is supply chain management $($SCM$)?$

a$.$ 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

b$.$ connects the plans, methods, and tools aimed at integrating separate enterprise system

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

d$.$ takes information entered into a given system and sends it automatically to all downstream systems and processes