The relationship between Young's modulus Y, Bulk modulus K and modulus of rigidity $\eta$  is

• A

  $\mathrm{Y}=\frac{9\mathrm{\eta K}}{\mathrm{\eta }+3\mathrm{K}}$

• B

  $\eta =\frac{9\mathrm{YK}}{\mathrm{Y}+3\mathrm{K}}$

• C

  $\mathrm{Y}=\frac{9\mathrm{\eta K}}{3+\mathrm{K}}$

• D

  $\mathrm{Y}=\frac{3\mathrm{\eta K}}{9\mathrm{\eta }+\mathrm{K}}$