What is the equation of tangent line ?

A function f(x) satisfies f(4) = -4.2 and f'(4) = 3.5. What is the equation of the tangent line of f(x) at x = 4? O a. y = 3.5x + -5.60 O b. y = -3.5x + -30.80 O c. y = 3.5x + -18.20 O d. y = -3.5x + 7.00 O e. y = 3.5x + 1.40 O f. y = -3.5x + 39.20