What are these animals called?
1) They are called a cat.
2) They are called cat.
3) They are called cats.
4) They are called the cat.
The first one doesn't look correct as I am not referring to one cat.
The second one seems problematic as a countable noun should either exist as a plural or be preceded by a determiner.
The third one seems promising as cats are in a generic sense.
The fourth seems wrong as I am not referring to any specific cat.
Which of the above is correct?