When determining the number, type, and size of Horizon View components to be installed, which three pieces of information must an architect know?

When determining the number, type, and size of Horizon View components to be installed, which three pieces of information must an architect know? (Choose three.)
A. Number of concurrent users who will connect to the environment.
B. Type of client that will be used by the users.
C. Version of Windows that will be used for the virtual desktops
D. Type of desktop pools that will be provisioned.
E. Maintenance windows and availability requirements for the environment.