The first and last are both correct. The middle one is not.

It's actually a really interesting question, and my first impression is also active voice: will graduate/will be graduating. However, if you're going to read a little more widely in English (I hope you will), then this is an interesting look at the verb "to graduate", and how meaning evolves over time: http://grammar.quickanddirtytips.com/graduated-or-graduated-from.aspx