One mole of each of the following coordination compounds is dissolved in one liter of water:
(a) [Co(NH₃)₆]Cl₃; (b) K4[Fe(CN)₆]; (c) [Ni(NH₃)₆]Cl₂; and (d) [Ru(NH₃)₄Cl₂]Cl.
Rank the solutions in order of increasing electrical conductivity.