Door #3, Magura HS33, Hydraulic rim brakes. they are a closed system,
once initially adjusted ,
the Pads literally snap in place on the slave cylinders..
they now come on one booster arch and include a second one to fit on the end bolts.

they're what came on My Koga-Miyata Trekking bike, great brake ,
as long as you have a 22.2 bar, not a road bar..
as they have a straight type lever..