Which Logitech app do I need to download for the mouse

I have a simple M510 Logitech Wireless mouse. I'm having some problems with the inconsistency in its functionality, so before you tell me to just use the default Windows drivers: I'd love to do that but some things are not working for me, so I want to try using the official vendor drivers…

Here is my problem: I go to the download screen for the M510 mouse on Logitech.com, and I'm presented with three downloads:

1. Logitech Setpoint
   "Setpoint lets you customize your mouse, keyboard, touchpad and numberpad settings in Windows."
   OK, software that lets me customize my device sounds like it would need drivers to interact with the device. Plus, I think in the past I have installed Setpoint before when I wanted drivers for my Logitech products.

2. Logitech Options
   "Logitech Options software lets you customize your device settings."
   Um, that sounds like the same thing as Setpoint. How do I differentiate between these two options?

3. Logitech Unifying Software
   OK, I know that the Mouse communicates with the computer through a USB "Unifying" Wireless receiver. So, that sounds like it could also have a driver.

I want to install the official drivers for this mouse, but I certainly don't want to have to install three pieces of software for a plain-old Wireless mouse.

Which of these is the right option?