Which is NOT true of use cases?a$.$They are formal ways of representing how a business system interacts with its environmentb.They can be thought of as an external or functional view of a business processc.They illustrates the activities that are performed by the users of the systemd.They sometimes are called business scenarios $($although use case is generally preferred$)$e$.$They illustrate what starts $($or triggers$)$ an event, all the people that are involved, and how the system provides value