Need a Help MAXI 77 design category and sailing category

I am the owner of MAXI 77 in Lithuania.
There was a problem registering the yacht with the sailing areas and design category of the yacht MAXI 77 - I was given a category D that it is an inland water category.
Maybe you have information on where to find out what yacht MAXI 77 sailing category and design category?
Thank you for your reply

Your best bet would be to contact Maxi Yachts in Sweden:

They even have a form there for asking them questions.