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The face-centred stencil is second-order _________

(a) always

(b) only when the centroid of the face and the line connecting the two cells meet

(c) only when the centroid of the face and the line connecting the two cells do not meet

(d) never

This question was posed to me in an online interview.

My question is based upon Diffusion Problem in chapter Diffusion Problem of Computational Fluid Dynamics

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