Answer: 4) Fact finding
Step-by-step explanation:
The requirement modelling is the process of fact finding that basically describe the present system. It also identify the specific requirement and analysis for the latest system.
This requirement model basically focus on the different concept according to the needs of the user. It help in the system by focusing on proper requirement in the external system.
Therefore, Option (4) is correct as, all the other options does not involve in the requirement modelling process.