The correct choice is (a) Minimize lv

Best explanation: For the quadratic functional given by the equation Iv(v)=\(\frac{1}{2}\)Bv(v,v)-l(v), one can state that the equations governing steady flows of viscous incompressible fluids are equivalent to minimize Iv(v), subject to the constraint \(\frac{\partial v_x}{\partial x}+\frac{\partial v_y}{\partial y}\)=0. It is a constrained problem of finding velocity.