Which shows 60^2 - 40^2 being evaluated using the difference of squares method?

(A) 60^2-40^2 = (3600+1600) (3600-1600) = 10,400,000

(B) 6^2-40^2=3600-1600=2,000

(C) 60^2-40^2 = (60-40) ^2=20^2=400

(D) 60^2-40^2 = (60+40) (60-40) = (100) (20) = 2,000

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