$\begin {array} {1 1} (1)\;Calcium \: chloride & \quad (2)\;DNA\: ligase \\ (3)\;Ethylene \: diamine\: tetra \: acetic\: acid & \quad (4)\;Restriction \: endonuclease \end {array}$
(A) (B) (C) (D)
(1) (I) (IV) (III) (II)
(2) (IV) (I) (II) (III)
(3) (I) (IV) (II) (III)
(4) (IV) (III) (II) (I)