Reaction 1: CO( g ) + 3 H 2 ( g ) ⇄ CH 4 ( g ) + H 2 O( g ) K 1 = [CH 4 ][H 2 O ] [CO][H 2 ] 3 Reaction 2: CO 2 ( g ) + H 2 ( g ) ⇄ CO ( g ) + H 2 O( g ) K 2 = [ CO ][H 2 O ] [CO 2 ][H 2 ] Reaction 3: CH 4 ( g ) + 2 H 2 O ( g ) ⇄ CO 2 ( g ) + 4 H 2 ( g ) K 3 = ? The chemical equations and equilibrium expressions for two reactions at the same temperature are given above. Based on the information, which of the following expressions can be used to calculate the value of K 3 for reaction 3 at the same temperature?