Choose the Best Definition of Systems Integration

Choose the best definition of systems integration.

A) Systems integration is the process of joining different systems or subsystems into one larger system and ensuring that they function as one system.
B) Systems integration is separating one company into two or more separate legal entities.
C) Systems integration is a combination of two separate companies into a new legal entity.
D) Systems integration happens when one company purchases another company to acquire all or most of the shares, and therefore control over that company.