设函数y=f(x)在x=x0点处可导,则曲线y=f(x)在(x0,y0)处切线方程为____
A.y-y0=f(x0)(x-x0) B.y-y0=f(x)(x-x0) C.y-y0=f'(x0)(x-x0) D.y-y0=f'(x)(x-x0)