Which of the Following Is True of Maritime Liens

Which of the following is true of maritime liens?

A) They attach to the res and travel with it.
B) They require possession in both common law and civil law countries.
C) In civil law countries, the owner is not essential to the existence of a lien against a ship.
D) If a vessel is sold, the lien does not go with the ship, if the new owner is unaware of its existence.