If x - 2y + k = 0 is a tangent to the parabola y2 - 4x - 4y + 8 = 0, then the slope of the tangent drawn at (l, k) on the given parabola is

1
\(\frac{-5}{2}\)
2
2
3
-2
4
\(\frac{2}{5}\)

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