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Which of the following statement(s) is/are correct regarding phylum mollusca?

A. They are bilaterally symmetrical, triploblastic and coelomate animals.

B. Body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot and visceral hump.

C. The mouth contains a file-like rasping organ for feeding, called radula.

D. All of the above