The main problem with using installed software instead of hosted software for customer relationship management is that:

e$.$ the software requires so much memory that many companies cannot accommodate it on their servers

a$.$ the information entered into the system needs to be synced at regular intervals or it does no good

d$.$ the software requires the cooperation of all departments or else it is not as effective as it could be

b$.$ the information entered into the system needs to be done so in a specific manner that requires extensive training

c$.$ the software requires too much maintenance from a licensed technologist