If the refractive index of medium b with respect to medium a and that of medium c with respect to medium b are given as nᵦₐ and nᵦ respectively, then the refractive index of a medium c with respect to a medium a can be found by using the relation
nₐ=nᵦₐ×........

A. nᵦ
B. nₐ
C. nₐ
D. nᵦₐ