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Cookies required for all website functionality needed by site visitors. This includes authentication, language selection, etc. From the visitor's perspective, this means "Allow only cookies that I may need, but do not track me".
All cookies that are not assigned to an explicit level are considered to be cookies identifying the visitor, i.e. user tracking cookies, which are not really needed, but are useful for the site owner if using marketing features.
Allows all cookies, no matter what their level is. From the site visitor's perspective this means "Allow all cookies now and in the future".