A line passing through the point \( (21,30) \) and normal to the curve \( y=2 \sqrt{x} \) can ha...

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A line passing through the point \( (21,30) \) and normal to the curve \( y=2 \sqrt{x} \) can have the slope
(a) -5
(b) 3
(c) -2
(d) 2
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