Which of the following characters for Mollusca are correct?

(i) Body have distinct head, muscular foot and visceral hump.

(ii) A soft and spongy layer of skin forms a mantle over the visceral hump.

(iii) The space between the head and the mantle is called the mantle cavity.

(iv) Mantle cavity have feather like gills which related with respiratory and excretory functions.

(v) The mouth contains a file-like rasping organ for feeding, called radula.

(vi) They are usually monoecious and oviparous with indirect development.