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Which of the following demonstrates the formation of an ionic compound involving the elements Na and S? a. Na2+ + S2- → NaS b. Na+ + Na+ + S2- → Na2S c. Na+ + Na+ + Na+ + S3- → Na3S d. Na+ + S- → NaS e. Na2+ + Na2+ + Na2+ + S3- + S3- → Na3S2