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Bulb and wired remote.
And of course, thanks! I probably wouldn't recommend doing it this way though as I have read there is always the potential for damage to the sensor for such a long exposure. Not to mention that long exposures create long exposure noise, and for such a long exposure like this one, there was a ton, with lots of hot spots and bright pixels. The usual way for star trails is to take multiple shorter exposures then blend them later. And if I was going to attempt this again that is probably what I would do. Shoot a single exposure with settings to expose the ground properly, then do the multiples for the star trails and blend it all together later.