Some equations give the viscosity as an explicit function of shear stress, n = n(t). Two equations of this form are: n A+B 1+ B [1 + ()] ** D n = 1+ Etm (1) (2) where A, B, C, D, E, and m are constants. a. Which of the above models (if either) is capable of showing a zero-shear viscosity? What is the zero-shear viscosity in terms of the constants. b. Repeat (a) for an infinite shear rate viscosity. C. Which (if either) can exhibit a power-law region? What is the power-law constant n in this region in terms of the parameters in the equation?