The general solution to the DE y" - 6y +9y = 0 is A. y = C₁e³+ C₂te³, B. y = C₁e³ + С₂е-3, C. y = C₁e³z + С₂x²³, D. y = C₁ sin(3x) + C₂ cos(3x), E. None of these.

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