nsa1234:
By submitting your deposit, you are effectively accepting the offer and reserving your seat. Of course, if you decide not to attend for some reason, you can always send in your withdrawal though you'll lose your deposit. That is, after all, the nature of deposits!
If you are still confused or have an unusual set of circumstances as to why you want to parse these out, just give the admissions office at Darden a call. It's always best to get the answer directly from the horse's mouth.