15. The production of recombinant DNA (DNA cloning) involves the following 4 steps. Please put them into correct experimental order. I. Insertion of foreign DNA fragment into a cloning vector. II. Preparation of fragments of vector and foreign DNA with compatible ends. III. Introduction of recombinant DNA into a recipient cell for replication. IV. Selection of cells containing the correct recombinant DNA. (A) I→II→III→IV (B) II→I→III→IV (C) II→III→I→IV (D) II→III→I→IV (E) II→I→III→IV