Which of the following is the main function of a DBMS ?

A Database Management System (DBMS) is software designed to manage and organize data efficiently. Its primary role involves storing data securely in structured formats, which corresponds to option A. Beyond storage, a DBMS allows users and applications to modify data through operations like insertion, updating, or deletion, fulfilling option B. Additionally, it enables users to query and retrieve specific information from the database using languages like SQL, covering option C. Since a DBMS integrates storage, manipulation, and retrieval into a unified system to ensure data integrity and accessibility, all listed functions are essential. Therefore, the correct choice is Option D (All of these), as it comprehensively captures the core responsibilities of a DBMS rather than isolating individual tasks.