In the finite element method, which option is not a natural and direct formulation of momentum and continuity equations?

In the finite element method, which option is not a natural and direct formulation of momentum and continuity equations? Correct Answer Penalty formulation

There are two different finite element models of momentum and continuity equations. The first one is a natural and direct formulation of momentum and continuity equations. It is known as the velocity-pressure formulation or mixed formulation. Lagrange multiplier formulation is similar to the velocity-pressure formulation. The penalty formulation is not natural and direct.
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