Dragon Rider Ruins/Second Floor Northern Corridor

You enter the northern corridor through the door in the Grand Hall. On your left is a landslide that blocks the way to the eastern corridor, and on your right there is three doors before the northern corridor becomes the western corridor

The corridor itself is shabby, the plain stone walls crumbling after hundreds of years. Be careful of rocks falling on you.

So will you go through the first room, the second room, or the third room. Or will you go to the western corridor?