Which of the following is an example of a legacy system?
A) Transaction processing system running on a mainframe
B) Scalable grid computing system
C) Web services running on a cloud computing platform
D) MDM software
E) Quantum computing system
A firm's IT infrastructure provides the foundation for supporting all the information systems in the business.
Today, most system and application software is custom built by in-house programmers.
Systems integration means ensuring the legacy systems work with new elements of the infrastructure.