Which of the following relate the flux of one component to the composition gradient of the other independent constituent in ternary system?

Which of the following relate the flux of one component to the composition gradient of the other independent constituent in ternary system? Correct Answer Off-diagonal

Actually, by using linear extension of Fick’s law we introduce the cross or off-diagonal diffusion coefficient which relate the flux of one component to the composition gradient of the other independent constituent in ternary system.
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For steady-state diffusion, diffusion flux is proportional to the concentration gradient. Concentration gradient is: