Let f(x, y) be a function whose partial derivatives exist and are continuous at a point (a, b). Which of the following statements are true? Select all that apply. fy(a, b) is the slope of the tangent line to the O cross-section y = b at the point (a, b, f(a, b)) fæ(a,b) is the slope of the tangent line to the cross-section y = b at the point (a, b, f(a, b)) fy(a, b) is the slope of the tangent line to the O cross-section x = a at the point (a, b, f(a, b))

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