18. In the graph of the function y = f(x) below, A and B are two points on the smooth, continuous curve. y = f(x) X1 What is the expression for the gradient of the chord AB? f(x1) А. В. f(x1-Xo) С. f(x1)-f(xo) D. f(x1-f(xo)) X1 X1-Xo X1-Xo X1-Xo

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