Which of the following statements is correct regarding the equilibrium constant $(K)$?

• A
  The equilibrium constant of a reaction changes with temperature.
• B
  The equilibrium constant depends on the initial concentration of the reactants.
• C
  The equilibrium constant for the reaction $3Fe_{(s)} + 4H_2O_{(g)} \rightleftharpoons Fe_3O_{4_{(s)}} + 4H_{2_{(g)}}$ is the same whether the reaction is carried out in an open or closed vessel.
• D
  If the reaction is multiplied by $2$,the equilibrium constant becomes double.