Which one of the following statement regarding coelom of given animals is correct?

Acoelomates are animals that have no body cavity or coelom. E.g., poriferans, coelenterates, ctenophores, flatworms, etc. Pseudocoelomates are animals that have false or pseudocoelom. E.g., Aschelminthes. Coelomates are animals that have true coelom enclosed by mesoderm on both sides. E.g., Annelida to Arthropoda.