The three powers of the Senate are:
- Confirm Presidential appointments
- Try cases of the impeachment of federal officials
- Ratify treaties
The other options listed are not exclusive powers of the Senate:
- Initiate revenue bills is a power that is exclusive to the House of Representatives.
- Impeach federal officials is also a power of the House of Representatives (the Senate conducts the trial).
- Elect the President in the event of an Electoral College tie is a power of the House of Representatives, not the Senate.
Therefore, the correct answers are the first, fourth, and sixth options.