In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (?), (ii) molecular diffusivity (?) and thermal diffusivity (?). The units of these quantities are ?

A. ? , ? and ? all have units of m2/s

B. ? , ? and ? all have units of m/s

C. ? and ? have units of m/s, while ? has unit of m2/s

D. ? and ? have units of m2/s, while ? has unit of m/s
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