LifeNotLived

I am rather confused by the room draw application. I only want to select room options where I will live alone--that means a studio, or a 1 bedroom 1 bathroom apartment or a 2 bedroom, 1 bathroom apartment, with the second bedroom not occupied. I am not sure if I select "1 bedroom" as a housing preference that I won't be placed with a roommate in a second room. Can anyone shed some light on this for me? What options should I put if I want to live by myself? And yes, I know my chances of getting a studio or a 1 bedroom apartment by myself, are slim/non-existent, but if it doesn't work out, I am going to live off campus, so this is just to see if I get lucky.