If two different tangents of \( y^{2}=4 x \) are the normals \( \mathrm{P} \) to \( x^{2}=4 \) b...

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If two different tangents of \( y^{2}=4 x \) are the normals
\( \mathrm{P} \) to \( x^{2}=4 \) by, then
(a) \( |b|\frac{1}{2 \sqrt{2}} \)
(b) \( |b|\frac{1}{\sqrt{2}} \)
(c) \( |b|\frac{1}{2 \sqrt{2}} \)
(d) \( |b|\frac{1}{\sqrt{2}} \)
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