Which of the following is water-gas shift reaction?

The mixture of& $CO$ and~${H}_{2}$~is called as water gas. As the mixture of~$CO$~and~${H}_{2}$~is used for the synthesis of methanol and a number of hydrocarbons, it is also called 'syn gas' or synthesis gas.

The process of producing 'syn gas' from coal is called coal gasification.

C \left(s\right) + {H}_{2}O \left(g\right) \to CO\left(g\right) + {H}_{2}\left(g\right)</p><p>The production of dihydrogen~can be increased~by reacting carbon monoxide with steam in the presence of iron chromate as a catalyst.</p><p>CO\left(g\right) + {H}_{2}O\left(g\right) \to ${CO}_{2\left(g\right)} + {H}_{2\left(g\right)}</p><p>This is called water gas shift reaction.</p>$