What id D ab called in the Fick‚Äö√Ñ√∂‚àö√ë‚àö¬•s law?$

What id D ab called in the Fick‚Äö√Ñ√∂‚àö√ë‚àö¬

1.	What id D _ab called in the Fick‚Äö√Ñ√∂‚àö√ë‚àö¬•s law?$
A.	Thermal conductivity
B.	Density coefficient
C.	Diffusivity
D.	Electrical conductivity
Answer» D. Electrical conductivity