NYU Computer Science at CAS or Tandon

Hi, I am a current senior that is eager to join NYU for college, My intended major is Computer Science, but the information about the major threw me off, Apparently there are two computer science programs, one at CAS and another at Tandon(http://engineering.nyu.edu/academics/programs/computer-science-bs/tandon-cas-cs-programs)

one offering BA in Art ? and one offering BS in Science ?
What exactly does this means ? Would my diploma says BA in Art if I graduate from CAS ?To put it in a easier way, why does NYU has two computer science programs ? What makes them different
I tried research, I seen people saying you are studying a lot more social studies at CAS ? Please help me. Thank you so much.

Sincerely