Choose the correct relationship between Poisson's ratio $(\sigma)$,bulk modulus $(K)$,and modulus of rigidity $(\eta)$ of a given solid object:
- A$\sigma=\frac{3 K -2 \eta}{6 K +2 \eta}$
- B$\sigma=\frac{6 K +2 \eta}{3 K -2 \eta}$
- C$\sigma=\frac{3 K+2 \eta}{6 K+2 \eta}$
- D$\sigma=\frac{6 K -2 \eta}{3 K -2 \eta}$
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