What does system integration consist of?

Option-D........... Meaning Option-A & C both are correct.

Integration means bringing  the components together.

A & C

Assuring that the pieces of a project come together at the right time, and The pieces of the project function as an integration unit

is defined as the process of bringing together the component subsystems into one system and ensuring that the subsystems function together as a system.information technology system , they can be vertical or star or horizontal systems each one has its advantage / dis advantage The system integrator  brings together discrete systems utilizing a variety of techniques such as computer net work, enterprise ,  application integration management , business process or manual programming

System Integration means using all the systems together on the same platform to run and complete the business transactions and all activities required for the business, Now a days we have ERP systems that almost covers all the areas of the business however there are certain small and very important areas which is done either in excel or in some small tolls or programs developed in-house or elsewhere , to bring this to the main system that is ERP is called integration so that all system talks to each other, it can be one way or two way integration......