What is primarily used in the RAD Systems Development Approach to transform documentation into working software?

The correct answer is grounded in the nature of Rapid Application Development (RAD), which emphasizes quick development and iteration of software prototypes. In the RAD approach, 4th generation languages (4GLs) and tools play a crucial role because they are designed to be more user-friendly and facilitate quicker development tasks compared to traditional programming languages.

4GLs provide high-level abstractions that enable developers to create applications with less coding effort. They often include features for creating user interfaces, managing databases, and automating repetitive tasks. This capability aligns with RAD's goal of transforming documentation—such as requirements specifications and design mockups—into functional software quickly and efficiently, allowing for rapid feedback and iterative improvement.

In contrast, third generation languages typically require more intricate programming skills and do not inherently support the rapid prototyping and iterative processes that RAD emphasizes. Fifth generation languages focus more on artificial intelligence and problem-solving rather than on the rapid development of applications. Script-based tools, while useful for specific tasks, may lack the comprehensive capabilities offered by 4GLs in the context of complete application development within the RAD framework.