The dependence of Gibbs free energy on pressure for an isothermal process of an ideal gas is given by [MP PET 1996]

• A.                 \[\Delta {{G}_{T}}=nRT\,\ln \,\frac{{{P}_{2}}}{{{P}_{1}}}\]            
• B.                 \[\Delta {{G}_{T}}=nRT\,\ln \frac{{{V}_{2}}}{{{V}_{1}}}\]
• C.                 \[\Delta {{G}_{T}}=nRT\,\log \,\frac{{{P}_{1}}}{{{P}_{2}}}\]          
• D.                 \[\Delta {{G}_{T}}=nRT\,\log \,\frac{{{V}_{2}}}{{{V}_{1}}}\]