A solution is prepared by adding 50.0 g of NaNO₃ to 50.0 g of H₂O. It is stirred at 70°C until it becomes clear. Then, it is cooled down to 40°C where it is observed to be still clear. Select the statement that correctly describes the solution at 40°C.  (Solubility of NaNO₃ at 40°C is 102 g NaNO₃ per 100 g H₂O.)