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I. The parties to a labor dispute can validly submit to voluntary arbitration ___________. (1%)
(A) any disputed issue they may agree to voluntarily arbitrate
(B) only matters that do not fall within the exclusive jurisdiction of the Labor Arbiter
(C) any disputed issue but only after conciliation at the National Concililation and Mediation Board fails
(D) any disputed issue provided that the Labor Arbiter has not assumed jurisdiction over the case on compulsory arbitration
(E) only matters relating to the interpretation or implementation of a collective bargaining agreement.