If the 4th term in the expansion of \( \left(p x+\frac{1}{x}\right)^{n}, n \in N \) \( \mathrm{P...

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If the 4th term in the expansion of \( \left(p x+\frac{1}{x}\right)^{n}, n \in N \)
\( \mathrm{P} \) is \( \frac{5}{2} \) and three normals to the parabola \( y^{2}=x \) are

W drawn through a point \( (q, 0) \), then
(a) \( q=p \)
(b) \( qp \)
(c) \( qp \)
(d) \( p q=1 \)
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