The velocity field of incompressible flow in a Cartesian system is represented by\(\vec V = 2\left( {{x^2} - {y^2}} \right)\hat i + v\hat j + 3\hat k\) Which one of the following expressions for v is valid?

• A. -4xz + 6xy
• B. -4xy – 4xz
• C. 4xz – 6xy
• D. 4xy + 4xz