jamesgang wrote in
:

Yes, we all agree, what he wants makes no sense. But what he
wants is for the light to be off when ALL the switches are down.

That's not difficult. All he needs to do is flip all the switches down, and then look at the light:
-- if the light is off, he's finished.
-- if the light is on, remove a faceplace and turn any one of the four switches upside down.