The mathematical expression for the change in free energy of a system is ΔG=ΔH−TΔS. Which of the following statements best describes a term in this equation?

a) ΔG represents the enthalpy change of the system.
b) ΔH represents the temperature change of the system.
c) T represents the entropy change of the system.
d) ΔS represents the change in free energy of the system.