If you had to access an unfamiliar flash drive (or other data storage), what safety precautions would you take?
The safest option is obvious, don't try to access its contents, but if you absolutely had to, what steps would you take to minimize/contain any potential harm to your device/network?
They mean the USB bus. But killing the bus is a driver-level thing that the kernel controls, not the user. You can disable the port with CLI commands or a GUI depending on the OS, but killing the bus requires uninstall of the driver or manually shorting the caps directly on the mainboard, which is dumb.