To answer this question, you need to understand the tools used for creating and debugging user-defined functions in a database system. Let's go through each option to understand why it is correct or incorrect:
Option A) SQL Assist - SQL Assist is a tool that provides assistance and suggestions while writing SQL queries. However, it is not specifically designed for creating and debugging user-defined functions.
Option B) Control Center - Control Center is a graphical administration tool used for managing and monitoring a database system. It does not provide specific functionality for creating and debugging user-defined functions.
Option C) Command Editor - Command Editor is a tool that allows you to write and execute SQL statements. While it can be used to create user-defined functions, it does not provide specific debugging capabilities.
Option D) Developer Workbench - Developer Workbench is a tool that is commonly used to create and debug user-defined functions. It provides an integrated development environment (IDE) with features such as code editing, debugging, and testing of user-defined functions.
The correct answer is D) Developer Workbench. This option is correct because it is specifically designed for creating and debugging user-defined functions.