Kirasaurus,
I have the exact same question as you. You want to know if it's like the CP where they accept you, and then tell you which of the roles you applied for you will be doing, or if they tell you, "of all the internships you applied for, these are the roles that are interested in you, which would you like?" I don't know, but because after the initial recruiting phone screen the different internships go to different departments, I would imagine it's up to the departments. Like DFTW probably only offers their roles to only one applicant at a time. So if they make a decision on you first, then you'll hear back first, and they'll give you a short window to decide, and then you'll have to decide whether to wait for something else or take the internship offered.
Though why anyone would turn down a DFTW planner internship waiting for a better one, I don't know.