Select the letter-cluster that can replace the question mark (?) in the following series.
ADG, CGK, EJO, ? , IPW
(A + 2)(D + 3)(G + 4) = CGK
(C + 2)(G + 3)(K + 4) = EJO
(E + 2)(J + 3)(0 + 4) = GMS
(G + 2)(M + 3)(S + 4) = IPW
$$\therefore$$ The correct answer is option D.
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