Final answer:
Fe3+ is oxidized and Cu+ is the reducing agent in this redox reaction. The oxidation number of Cu+ increases, and the total number of electrons increases.
Step-by-step explanation:
In this redox reaction, Fe3+ is oxidized because its oxidation number increases from +3 to +2. On the other hand, Cu+ is the reducing agent because it is being oxidized, as its oxidation number increases from +1 to +2. The oxidation number of Cu+ does not decrease. Instead, it increases.
The total number of electrons in the reaction increases because Fe3+ gains one electron to become Fe2+, while Cu+ loses one electron to become Cu2+.