A velocity field is given as
$\vec{V}=3x^{2}y\hat{i}-6xyz\hat{k}$ 
Where x, y, z are in m and V m/s. Determine if
(i) It represents an incompressible flow
(ii) The flow is irrotational
(iii) The flow is steady
(a) (i) and (iii)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (i) only