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Unit vectors

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Select the unit vector in the direction of v, with, vector, on top, equals, left parenthesis, minus, 1, comma, minus, 7, right parenthesis.

(Choice A)
left parenthesis, minus, start fraction, 1, divided by, square root of, 50, end square root, end fraction, comma, minus, start fraction, 7, divided by, square root of, 50, end square root, end fraction, right parenthesis
(Choice B)
left parenthesis, start fraction, 1, divided by, 7, end fraction, comma, 1, right parenthesis
(Choice C)
left parenthesis, minus, start fraction, 1, divided by, square root of, minus, 8, end square root, end fraction, comma, minus, start fraction, 7, divided by, square root of, minus, 8, end square root, end fraction, right parenthesis
(Choice D)
left parenthesis, minus, 1, comma, 0, right parenthesis

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Linear algebra