Consider a completely randomized design with five treatments: A, B, C, D, and E. The ANOVA F-test revealed significant differences among the means. A multiple-comparison procedure was used to compare all possible pairs of treatment means at α = .05. The ranking of the five treatment means is summarized here. Identify which pairs of means are significantly different.

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a. A C E B D c. A C E B D d. A C E B D