If the line \( x-1=0 \) is the directrix of the parabola \( y^{2}-k...

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If the line \( x-1=0 \) is the directrix of the parabola \( y^{2}-k x+8=0 \), then one of the values of \( k \) is
P
(a) \( \frac{1}{8} \)
(b) 8
(2000, 2M)
WV
(c) 4
(d) \( \frac{1}{4} \)
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