htaccess-task: geoblocking related to domainname = I have three domains all on the same root directory, ony one domain shall have geoblocing activated

this taks needs an htaccess-expert: This is the task description: I do already have a geoblocking established inside a htaccess file in the root directory. But I now have THREE DOMAINS all inside the SAME ROOT directory!!! Your task is to make sure the geolocation-blocking ony relates to ONE of those THREE domains! The geolocation-blocing already exists. But it shall be activated only if the website-content is visited via [login to view URL], and not activated if the site gets visited via [login to view URL] or domainC.com. That means, I want you to establish a "switch", to make sure the geolocation-blocking will only be applied IF the site-content gets called via a specific domainname, like [login to view URL], and will NOT be get considered the page-content gets called from [login to view URL] . Again: all three domains are located in the very same root-folder / root-directory