Consider the following statements regarding streamline(s) :i) It is a continuous line such that the tangent at any point on it shows the velocity vector at that pointii) There is no flow across streamlinesiii) \(\frac{{{\rm{dx}}}}{{\rm{u}}} = \frac{{{\rm{dy}}}}{{\rm{v}}} = \frac{{{\rm{dz}}}}{{\rm{w}}}\) is the differential equation of a streamline, where u, v and w are velocities in directions x, y and z, respectivelyiv) In an unsteady flow, the path of a particle is a streamlineWhich one of the following combinations of the statements is true?

• A. (i), (ii), (iv)
• B. (ii), (iii), (iv)
• C. (i), (iii), (iv)
• D. (i), (ii), (iii)