For a reaction studied over a wide temperature range, plots of ∆G°rxn/T vs. 1/T and of ∆G°rxn vs. T — Thermodynamics Chemistry Question

For a reaction studied over a wide temperature range, plots of ∆G°rxn/T vs. 1/T and of ∆G°rxn vs. T are linear. Which of the following must be independent of temperature?
I. ∆G°rxn
II. ∆H°rxn