The formulae for change in entropy

A. $$\Delta S = Rln\left( {\frac{{{V_2}}}{{{V_1}}}} \right) = - R\ln \left( {\frac{{{P_2}}}{{{P_1}}}} \right),$$

B. $$\Delta S = {C_P}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right),$$

C. $$\Delta S = {C_V}\ln \left( {\frac{{{T_2}}}{{{T_1}}}} \right),$$

D. All are correct

Answer: Option D