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Which of these methods cannot be used to reduce the errors due to cross-stream numerical diffusion?

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Which of these methods cannot be used to reduce the errors due to cross-stream numerical diffusion?

(a) Interpolation in the direction of flow

(b) Higher order interpolation profile

(c) Multi-dimensional interpolation profiles

(d) Changing the direction of interpolation

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Question is taken from Convection-Diffusion Problems topic in division Convection-Diffusion Problems of Computational Fluid Dynamics

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The correct choice is (d) Changing the direction of interpolation

The explanation is: The cross-stream numerical diffusion can be decreased by either interpolating in the direction of the flow which means multi-dimensional interpolation profiles or using a one-dimensional higher-order interpolation profile.

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