Let y=f(X) defines a twice-differentiable function and let y=T(x) be the line tangent to the graph of f at x=2. If t(X)>= f(X) for all real x, which of the following must be true ? A. f(2)>= 0 B. f'(2)>=0 C.f'(2)<=0 D./ f''(2)>=0 E.f''(2)<=0

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