Concept:A Database Administrator is mainly responsible for the design, implementation, and maintenance of databases.
Explanation:A Database Administrator, often called a DBA, ensures that an organisation’s data is stored securely and works efficiently.
The DBA plans the database structure, implements data models, and sets up user permissions.
Regular maintenance includes monitoring performance, managing backups, and recovering data when needed.
The work also covers data security and ensuring the database remains available for users.
Option A describes network packet sniffing, which falls under network analysis or security.
Option C describes data entry, an operator-level task and not the main duty of a DBA.
Option D describes penetration testing and vulnerability scanning of hardware and software, which is not the DBA’s core role.
Only Option B exactly matches the professional duty of a Database Administrator.
Answer:B. designs, implements and maintains a database