Which of the following statements are true?
$\text{(i)}$ Conservation of mass for an unsteady incompressible flow can be represented as $\nabla \cdot \vec{V}=0$, where $\vec{V}$ denotes velocity vector.
$\text{(ii)}$ Circulation is defined as the line integral of vorticity about a closed curve.
$\text{(iii)}$ For some fluids, shear stress can be a nonlinear function of the shear strain rate.
$\text{(iv)}$ Integration of the Bernoulli's equation along a streamline under steady-state leads to the Euler's equation.
- $\text{(ii) and (iv)}$ only
- $\text{(i), (ii) and (iii)}$ only
- $\text{(i) and (iii)}$ only
- $\text{(ii) and (iv)}$ only
