If the equilibrium constant for a reaction A + B <----> C + D is K, which is true of the equilibrium constant K* for the reaction C + D <----> A + B under the same conditions?

A) K* = K
B) K* = 1/K
C) K* = 1 - K
D) K* = 1 - (1/K)
E) K* = 1 + K

K' = 1/K