Read-only fields in Material Design

I am wondering how to style the fields in a form for users that have read-only access.

As per the Material Design guidelines, read-only fields should have a help text stating they are read-only. However, in case of a situation where the whole form is read-only, how should I style the text fields?

Should I use a disabled field style? Should I remove the outlined borders? (I am using outlined type of Material Design fields).