The applicant is the person who wishes to become a Norwegian citizen.
If you are a citizen of two or more countries, and one of them is an EU/EEA country, please choose the EU/EEA country.
When you apply, the UDI will consider which group you belong to, and whether you fill the requirements. Here you can check for yourself what the requirements are for the most common group of applicants. Remember that you may belong to more than one group.