When conducting high-level interviews with stakeholders of a project, what are the key questions that should be asked?

When conducting high-level interviews with stakeholders of a project, what are the key questions that should be asked?
A . How much usable storage are you looking for? What client OS will access this storage? Which applications will access this storage?
B . Which backup application is in use today? What is your change rate? How many clients will connect to the cluster?
C . What does your network architecture look like Do you have existing NAS infrastructure? Do you have 10Gb or 1Gb Which applications will access this storage?
D . Who are the application owners? How much usable storage is needed? What applications will be accessing the storage? How many users are in your Active Directory?

Answer: A