In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement?
(a) CO is oxidised to CO2 with steam in the presence of a catalyst followed by absorption of CO2 in alkali
(b) CO and H2 are fractionally separated using differences in their densities
(c) CO is removed by absorption in aqueous Cu2Cl2 solution
(d) H2 is removed through occlusion with Pd
