In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Question: Comparing the redox behavior of the silver and sodium systems:
Options: <1> Na + is a good oxidant, because its system has a high reduction potential. <2> Ag is an excellent oxidant, so it does not rust in the air. <3> Ag + is a good oxidant, and therefore easily reducible to metal. <4> The two metals dissolve in acid medium releasing H2 <5> The two metals dismute spontaneously in water.
3