The question is asking us to identify the plate that is not classified as a minor plate. Let`s examine each option:

1. Cocos Plate: The Cocos Plate is a tectonic plate located in the eastern Pacific Ocean, off the west coast of Central America. This plate is considered to be a minor plate.

2. Nazca Plate: The Nazca Plate is a tectonic plate located in the eastern Pacific Ocean, off the coast of South America. This plate is also considered to be a minor plate.

3. Caroline Plate: The Caroline Plate is a tectonic plate located in the western Pacific Ocean, to the east of the Philippines. This plate is classified as a minor plate.

4. Antarctic Plate: The Antarctic Plate is a tectonic plate that encompasses the continent of Antarctica and the surrounding oceanic crust. Despite being a significant plate due to its coverage of Antarctica, it is not considered a minor plate.

Therefore, the correct answer is option 4. The Antarctic Plate is not classified as a minor plate.