please quickly According to the mean-variance criterion, which one of the following investments dominates all others? Select one: a. E(r) = 0.15; Variance = 0.20 b. E(r) = 0.15; Variance = 0.18 c. E(r) = 0.05; Variance = 0.25 d. E(r) 0.25; Variance = 0.15 =

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