Which of the following is NOT a data retrieval tool?

• A. Light Pen
• B. Indexing System
• C. Microfilm Reader
• D. Bar Code Scanner

Answer: (A)

Data retrieval tools are systems or devices that directly fetch or guide access to stored information. A light pen is an input device used to point or select items on a screen; it doesn’t pull data from storage by itself. The other options actively support retrieval: an indexing system helps locate records efficiently, a microfilm reader provides access to archived documents, and a bar code scanner reads a code to trigger data lookup in a database. So the light pen is not a data retrieval tool.