Which of the following is the most important control related to the integrity of the data in the database?

An organization uses a database management system (DBMS) as a repository for data. The DBMS, in turn, supports a number of end-user developed applications which were created using fourth-generation programming languages. Some of the applications update the database.

Which of the following is the most important control related to the integrity of the data in the database?
A . End users have their read-only applications approved by the information systems department before accessing the database.
B . Concurrency update controls are in place.
C . End-user applications are developed on personal computers before being implemented on the mainframe.
D . A hierarchical database model is adopted so that multiple users can be served at the same time.

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Answer: B