Nordic countries are the group of countries of Northern Europe. These Nordic countries include Denmark, Finland, Iceland, Norway, Sweden and the territories of aland Iceland and faroe Iceland. Nordic countries have similar law , state and culture. Historically nordic countries have maintained close connection. Nordic countries are primarily socialist democratic.

Introduction:
The Nordic countries, also known as the Nordic region, are a group of countries located in Northern Europe. They share common cultural, historical, and linguistic ties, as well as a high standard of living and social welfare systems.

Identification of the Nordic countries:
Among the given options, the following countries are part of the Nordic region:

1. Norway:
Norway is a Nordic country located in the western part of the Scandinavian Peninsula. It is known for its stunning fjords, beautiful landscapes, and high quality of life. Norway is definitely a part of the Nordic region.

2. Sweden:
Sweden is another Nordic country located in Northern Europe. It shares borders with Norway to the west and Finland to the northeast. Sweden is known for its rich history, beautiful landscapes, and progressive social policies. Therefore, Sweden is also a part of the Nordic region.

3. Denmark:
Denmark is a Nordic country located in Northern Europe. It is the southernmost of the Scandinavian countries and shares borders with Germany to the south. Denmark is known for its historic landmarks, beautiful coastline, and high standard of living. Hence, Denmark is part of the Nordic region.

4. Switzerland:
Switzerland, while not a Nordic country, is often mistakenly associated with the region due to its geographical proximity. However, Switzerland is located in Central Europe, not Northern Europe, and is not considered part of the Nordic region.

5. Finland:
Finland is the last country mentioned in the given options, and it is indeed a part of the Nordic region. Finland is located in Northern Europe and shares borders with Sweden to the west and Russia to the east. It is known for its beautiful lakes, forests, and saunas.

Conclusion:
Based on the given options, the countries that are part of the Nordic region are Norway, Sweden, Denmark, and Finland. Switzerland is not part of the Nordic region. Therefore, the correct answer is option 'B' - 1, 2, 3, and 5.