When solid CuSO4 dissolves in water to make a 1M solution, the temperature of the system increases. — Thermodynamics Chemistry Question

When solid CuSO₄ dissolves in water to make a 1M solution, the temperature of the system increases. When solid NH₄NO₃ dissolves in water to make a 1 M solution, the temperature of the system decreases. Which statement(s) must be correct for these dissolving processes?
I ∆H° values for both processes have the same sign.
II ∆G° values for both processes have the same sign.