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A function n(x) satisfied the differential equation d2n(x)dx2?n(x)L2=0 where L is a constant. The boundary conditions are: n(0)=K and n ( ? ) = 0. The solution to this equation is

(A) n(x) = K exp(x/L) | (B) n(x) = K exp(-x/ |

(C) n(x) = K^{2} exp(-x/L) | (D) n(x) = K exp(-x/L) |

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