website design – Which option is better for read only mode?

I have an Angular application where I have used mat-form fields (Material components) to build the forms. Here I am having a requirement to implement a read only mode.

I hope disabling all mat form fields with its default style will not be an option. It will be visually ugly and contextually confusing. So decided disable the mat-form field and override it’s style. Options are

  1. Set border – hi light the mat-form element boarder
  2. Set background color – set background color to mat form field
  3. Remove all boarder and background color

Kindly share your thoughts which option is most suitable one for readonly mode?

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Thanks
Nuwan