Find the normal line for the level surface f(x,y,z) = 5x* + cos (4y) O a. r(t) = <6860.000, -2.206, 0.500> + t <7,8,2> %3D o b. r(t) = <6860.000, -2.206, 0.500> - t <7,8,2> %3D O c.r(t) = <7,8,2> - t <6860.000, -2.206, 0.500> %3D o d. r(t) = <7,8,2> + t <6860.000, -2.206, 0.500>

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