Equilibrium Constant Calculation

Consider a closed system at equilibrium involving the reversible reaction:

A(g) + B(g) <=> C(g) + D(g)

At a certain temperature, the initial concentrations of reactants and products were measured. It was found that at equilibrium, the concentration of A was 0.4 M, B was 0.4 M, C was 0.2 M, and D was 0.2 M. Using this data, determine which of the following statements regarding the equilibrium constant (K_eq) for the reaction at this temperature is true.