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In the formulation of the finite element model for fluids flows, which option is not correct about the penalty formulation?

In the formulation of the finite element model for fluids flows, which option is not correct about the penalty formulation? Correct Answer Involves natural and direct formulation of momentum and continuity equations

There are two different finite element models of momentum and continuity equations. The penalty formulation is based on the interpretation that the continuity equation is an additional relation among the velocity components. The constraint is satisfied in a least-squares (i.e., approximate) sense. This particular method of including the constraint in the formulation is known as the penalty function method. It does not involve the natural and direct formulation of momentum and continuity equations.

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