If the normal to the curve \( y=f(x) \) at the point \( (3,4) \) makes an angle \( \frac{3 \pi}{...

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If the normal to the curve \( y=f(x) \) at the point \( (3,4) \) makes an angle \( \frac{3 \pi}{4} \) with positive \( X \)-axis, then \( f^{\prime}(3) \) is equal to
(a) \( -1 \)
(b) \( -3 / 4 \)
(c) \( 4 / 3 \)
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