(A) Skin contains minute dermal scales
(B) Teeth are absent on both jaws
(C) Vertebrae are numerous and amphicoelous
(D) Fertilization is external
$\begin {array} {1 1} (1)\;B \: and \: C & \quad (2)\;B \: and \: D \\ (3)\;A \: and\: B & \quad (4)\;A \: and\: C \end {array}$
