The length of the perpendicular from the point \( (1,-2,5) \) on the line passing through \( (1,...

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The length of the perpendicular from the point \( (1,-2,5) \) on the line passing through \( (1,2,4) \) and parallel to the line \( x+y-z=0=x-2 y+3 z-5 \) is
(a) \( \sqrt{21 / 2} \)
(b) \( \sqrt{9 / 2} \)
(c) \( \sqrt{73 / 2} \)
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