For any two complex numbers \( z_{1} \) and \( z_{2} \), \( \left|z...

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For any two complex numbers \( z_{1} \) and \( z_{2} \), \( \left|z_{1}-z_{2}\right| \geq\left\{\begin{array}{l}\left|z_{1}\right|-\left|z_{2}\right| \\ \left|z_{2}\right|-\left|z_{1}\right|\end{array}\right. \)
\( \mathrm{P} \) and equality holds iff origin \( z_{1} \) and \( z_{2} \) are collinear and \( z_{1}, z_{2} \) lie on the same side of the origin.
If \( \left|z-\frac{3}{z}\right|=6 \) and sum of greatest and least values of \( |z| \) is \( 2 \lambda \), then \( \lambda^{2} \), is
(a) 12
(b) 18
(c) 24
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