In design and implementation of any reasoning application, there are 4 Rs involved: retrieve, reuse, revise, and retain.

case-based.

Explanation:

A software can be defined as a set of executable instructions (codes) or collection of data that is used typically to instruct a computer on how to perform a specific task and solve a particular problem.

Simply stated, it's a computer program or application that comprises of sets of code for performing specific tasks on the system.

A software development life cycle (SDLC) can be defined as a strategic process or methodology that defines the key steps or stages for creating and implementing high quality software applications. There are seven (7) main stages in the creation of a software and these are;

1. Planning.

2. Analysis.

3. Design.

4. Development (coding).

5. Testing.

6. Implementation and execution.

7. Maintenance.

A case-based reasoning application refers to a knowledge-based system that is designed and developed to use previous case scenarios (similar past problems) to interprete or proffer a solution to a problem.

In design and implementation of any case-based reasoning application, there are four (4) Rs involved: retrieve, reuse, revise, and retain.

it can either be 2. or 4. : ) tell me if i'm wrong or right