Answer: Option A- Portability
Step-by-step explanation:
A database system does not have to offer portability as a data control function. The term "portability" describes the capacity to move or migrate a database system from one environment or platform to another without undergoing substantial changes or losing functionality. Although it is a crucial factor for database systems, data control is not immediately impacted by mobility.
The crucial data control functions, however, are security, concurrency control, and integrity. Security guarantees that database access is restricted and safeguarded, preventing unauthorized access or alterations. Concurrent access to the database is controlled by concurrency control, which guarantees that several users can access the data concurrently without encountering any conflicts. By imposing regulations, restrictions, and data validations, integrity makes sure that the data in the database stays correct, valid, and consistent. For a database system to continue to be reliable, consistent, and secret, these operations are essential.
Keywords: Database System, Portability, Security, Concurrency control, Integrity