RAD software process model stands for

Explanation

RAD stands for Rapid Application Development. It is an incremental process model that compresses the development cycle by using component-based construction, heavy reuse and several teams working in parallel on different functional modules, aiming at a fully working system in a very short cycle (classically 60–90 days). The other three expansions are simply invented distractors; in particular RAD is a full development model, not merely a design approach, which rules out option 3.