What is this an example of?

An application is used by nearly all the employees in an organization to place and track orders, provide customer support, maintain and report on financials, and track product defects.
The application was written by the organization’s IT Department 10 years ago. The IT staff actively maintains it and adds features on a regular basis.
What is this an example of?
A. Vendor lock-in
B. A legacy application
C. An enterprise application
D. Service-oriented architecture

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