At 1 Atm Pressure, the Electrochemical Potential, of a Solute $\Im$

At 1 atm pressure, the electrochemical potential, of a solute in solution, :

A) Is the Gibbs Free energy per molecule
B) = RT ln C + z $\Im$ $\psi$ (where R is the gas constant, T is temperature, T is the Faraday and R is the electrical potential)
C) $=\mu^{\circ}+\mathbf{R T} \ln \mathbf{C}+\mathbf{z} \mathfrak{I} \Psi$
D) Is zero at equilibrium
E) Both A and C are correct