Creating a 3D Rainbow Rendering with Adobe Illustrator

I followed a tutorial on youtube called Easy 2D to 3D Illustration Hack for Beginners | Adobe Illustrator Tutorial by Adrianne Walujo. I wanted to learn a new skill and play in Illustrator.

Steps.
Create one big circle using ellipse tool.
Object > Path > Offset path [Setting Offset: -100, Joins: Miter, Miter limit: 4 (4time)]
Select all the circles (4) and cut it in half.
Window > 3D and Materials > Object > Inflate
Materials > Roughness 0.63, Metallic 0.2
Lighting > Intensity - 97%, Rotation - 90%, Height - 48%, Softness - 90%, Intensity - 50
Shadows > Distance from Object - 0, Shadow Bounds - 260
Final - Render with Ray Tracing.