Don't get too worked up over the number of tracks offered at Brooks; fact is, there's more crossover among disciplines than their website would lead you to believe. The reason the program has become so diverse is more a result of the school trying to adapt to what were, previously, fledgling technologies(Photoshop, the web, digital vs. film) that most photographers have already adapted to. The "primary" disciplines can probably break into 4 categories, which themselves break into a multitude of specialties:
Photojournalism
Portraiture
Commercial Photography
Fine Art
Photojournalism
As a high school student, this is the area you're likely most familiar with. As a yearbook or newspaper staff member, an editor sends you on an assignment to capture; the only difference is, you're not typically required to do any of the writing for the piece. This will change in the professional world, as newspapers and magazines can't always afford to send writers and photographers abroad for assignments. Not all magazine or news photojournalist positions require the same writing abilities, however the best and most glamorous assignments are typically reserved for those who can pull both duties. When I say "glamorous", I mean the globetrotting, 'never at home for more than a couple days at a time' stuff. What area of photojournalism you want to work in is up to you (News, Sports, Nature, Wildlife, Travel, etc.). Visit your local newsstand or book store's periodical section and pick your poison. As a photojournalist, you'll either work on a staff (regular paychecks) or freelance (irregular paychecks) role.
Portraiture
Nearly every professional photographer has at least some experience photographing people at some point in their career. Portrait photographers do it full-time and are adept at both studio and location work and often balance their time shooting families, kids, weddings, couples, etc. The better you get, the more you'll find you can focus on a particular area. Being a portrait photographer means you're gonna have to be your own boss and market yourself in order to earn money. It doesn't necessarily require the additional overhead of owning or renting studio space, but the most successful photographers in this field usually do, including wedding photographers. An extension of portrait photography is Glamour/Editorial Photography.
Commercial Photography
Commercial photography is a catch-all term for any kind of photography that help's promote or facilitate the sale of a company's product or service. Commercial photography could include shooting products, portraits or architecture. The better you get in a particular niche, the more you get hired for that one thing. One of the most competitive and lucrative fields of photography is Advertising Photography and typically involves shooting some sort of product that will appear in a print ad or product packaging. Because it's the most conceptual area of commercial photography, Brooks Institute breaks it out as a separate field of study. In advertising, you're typically working from your own studio with an ad agency or design firm that already has the shot planned out (angle, persective, props). Your job is to build the set in the studio according to how the agency's art director or designer's drawings and make them happy with the shot, because they in turn are responsible to their client. Most photographers in this field will start building niches in particular areas (automotive, food, fashion, etc.) and build their careers from there.
Fine Art
The most difficult to make money in, but the most individually expressive, because you're in control of the final product, from concept to execution.
As far as Digital Imaging and Digital Media are concerned, there isn't a photographer these days worth their salt who isn't well-versed in digital photo manipulation or it's capabilities. I'm not sure photography students are well-served with either of these two programs as separate fields of study.
If I were you, I'd take a serious look at Art Center's commercial photography program.