Dirt 5 Series X, Image Quality VS Resolution mode?

It seems these options changed from the DF preview. They had modes frame rate vs image quality which is easy to understand.

The options I have is resolution vs image quality which does not make sense

Is image quality mode fixed or dynamic lower resolution and what is the FPS? Does resolution mode have fixed res at lower graphical settings at a higher framerate?

The fact they renamed these modes right before release is kind of confusing