In the normal adult, hemoglobin A, which is composed of two alpha and two beta globins (A2B2), is the most prevalent, comprising about 95% of all hemoglobin. Two minor hemoglobins also occur: hemoglobin A2, composed of two alpha and two delta globins (α2δ2) comprises 2-3.5% of hemoglobin, while hemoglobin F, composed of two alpha and two gamma globins (α2γ2) comprises less than 2% of hemoglobin.

So, the correct answer is 'α2,δ2.'

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