Find the normal line for the level surface f(x,y,z) = 5x3 + cos (5y) + In (6z) = c at the point (4,7,7). o a. r(t) = <240.000, 2.141, 0.143> +t <4,7,7> o b. r(t) = <4,7,7> + t <240.000, 2.141, 0.143> %3D O c. r(t) = <240.000, 2.141, 0.143> - t <4,7,7> o d. r(t) = <4,7,7> - t <240.000, 2.141, 0.143>

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