E, G, K and 
$\mu$ represent the elastic modulus, shear modulus, bulk modulus and Poisson’s ratio respectively of a linearly elastic, isotropic and homogeneous material. To express the stress-strain relations completely for this material, at least
(a) E, G and $\mu$ must be known
(b) E, K and $\mu$ must be known
(c) any two of the four must be known
(d) All the four must be known