Should I apply for all the units... or just my first choice?

There's an internship opening for different units in the hospital. Should I apply to my top 3 choices... or just apply to one of them? I'm afraid the recruiter will think I'm not serious about the specific floor I want to work on. But then again, I want to apply everywhere just so I have a higher possibility of getting a job.
Pick the ones you like best, but don't go more than 3. Nothing wrong with covering your bets.Is there one unit that you like more than the others? Be sure to tell the recruiter, and that nurse manager, which one you want the most.
Definitely choose more than one, like previous posted recommended, not more than 3. There's nothing wrong with this. No sense putting all your eggs in one basket and not getting the spot. Do make it known what your preference is as #1 and don't apply for any that you aren't willing to take