Question: Which is the diffusion terms of the y-momentum equation?

Options

A : frac{partial au_{xy}}{partial x}+frac{partial au_{yy}}{partial y}+frac{partial au_{zy}}{partial z}

B : frac{partial au_{yx}}{partial x}+frac{partial au_{yy}}{partial y}+frac{partial au_{yz}}{partial z}

C : frac{partial au_{xx}}{partial x}+frac{partial au_{yx}}{partial x}+frac{partial au_{zx}}{partial x}

D : frac{partial au_{xy}}{partial y}+frac{partial au_{yy}}{partial y}+frac{partial au_{zy}}{partial y}

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