Please select each statement that is true in the case of modeling actors in the system.

Question $10$ options:

Use cases are always started by an actor.

Use cases are only started by actors who are human beings.

Use cases are always written from the point of view of the actors.

A use case is a specification of sequences of actions, including variant sequences and error sequences, that a system, subsystem or class can perform by interacting with outside actors $.$