For (B), your proposal requires the website have a database over current rules in every country they would be accessible from. Would a website then, in your opinion, be responsible for the accuracy of this database? We have to presuppose an official GeoIP source that would then be legally binding and under democratic control, but given such a database, would a website serving a wrong header to an IP associated with a specific country then be committing a crime in that country? What would the punishment be?