Calculate $\Delta$ G ^$\circ$ (KJ/mol) for the Following Electrochemical Cell: Cd(s) | Cd²⁺(aq)

Calculate $\Delta$ G ^$\circ$ (kJ/mol) for the following electrochemical cell: Cd(s) | Cd²⁺(aq) || Ni²⁺(aq) | Ni(s)

A) -23 kJ/mol
B) -25 kJ/mol
C) -27 kJ/mol
D) -29 kJ/mol
E) None of the above