已知f(x)=∫0xt5dtf(x)=\int_{0}^{x}t^{5}dtf(x)=∫0xt5dt,则f′′(x)=f^{\prime\prime}(x)=f′′(x)=( ).
(A)20x320x^{3}20x3
(B)5x45x^{4}5x4
(C)x5x^{5}x5
(D)x4x^{4}x4
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