Which of the following looks like a correct entry in the /etc/hosts file?

Which of the following looks like a correct entry in the /etc/hosts file?

A.
localhost 127.0.0.1 localhost.localdomain

B.
localhost.localdomain localhost 127.0.0.1

C.
localhost localhost.localdomain 127.0.0.1

D.
127.0.0.1 localhost.localdomain localhost

E.
localhost.localdomain 127.0.0.1 localhost