What does the following statement mean?

Buying ERP means the organization is "buying into a way of doing business"

A$.$ ERP vendors like SAP require use of the pre$-$designed processes they include that prevent any adaptations or changes

B$.$ ERP vendors like SAP describe their software as something that can be used uniformly across industry segments

C$.$ ERP vendors like SAP require that an organization buy all modules $($or components$)$ within SAP when they acquire SAP

D$.$ ERP vendors like SAP provide pre$-$built processes that an organization brings in when they buy the software and then trains its employees