Find the normal line for the level surface f(x,y,z) = 7x³ + cos (4y) + In (4z) = c at the point (8,7,8). %3D o a. r(t) = <8,7,8> - t <1344.000, -1.084, 0.125> %3D o b. r(t) = <1344.000, -1.084, 0.125> - t <8,7,8> O c. (t) = <8,7,8> + t <1344.000, -1.084, 0.125> o d. r(t) = <1344.000, -1.084, 0.125> + t <8,7,8> %3D

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