Raj is the UX designer who is working to improve the usability of an instant messaging app.

What is the correct UCD process that he should follow?

Analyze the existing version of the app to identify usability issues, create the updated design, evaluate it$,$ and then implement the changes in the design.

Analyze the usability issues, refine the design, and reserve the changes to release a new version of the app in an iterative process.

Design the UI based on the experience with the current app layout, and then analyze and implement the modified design.

Design a new layout for the app to give it a fresh look and analyze and implement the new look.