Which of the following is the correct expression for the concentration based equilibrium constant for the reaction: 2C(aq)+D(aq)2A(aq)+B(aq) A) Kc=[A]2[B][C]2[D] B) Kc=[C]2[D][A]2[B] C) Kc=[2A][B][2C][D] D) Kc=2[C]+[D]2[A]+[B]