If you're on a laptop model, you use the laptop's keyboard or mouse. I believe that for desktop models, if there is a keyboard or mouse plugged in at startup, it does not prompt.
> I believe that for desktop models, if there is a keyboard or mouse plugged in at startup, it does not prompt.
Which just underscores how ridiculous this new "security model" actually is if Apple had to put in an exception just to allow baseline required computer peripherals to work correctly.