Computer Science AB is no longer administered...
Depends really on the undergrad course you choose and if those APs will help you waive credits...It IS possible though. My Harvard interviewer was poised to graduate in 3 years thanks to her APs...she left the last sem pending and took a year studying in France...came back and then finished graduating.
So, going by her example it IS possible...But here's the deal...in her case(she was an Eco/History joint concentrator) she attended Harvard which has the core-curriculum. The Physics/Bio/Art History APs she took she used to satisfy some core requirements while gunning away at her Economics...she was done in three, and then decided to take on the additional History and got away with it.
I know I'm not being *very* helpful per se. But my point is, depends on the college you'll attend (some places simply dont accepts APs in some subjects. Stanford for instance, does not accept the English Writing AP) and the course you'll choose to major in (doesnt make sense to take the Chinese Culture AP unless you're majoring in it/can satisfy a core curriculum requirement).