Which of the followings about swimlanes in activity diagrams are correct $($choose all that apply$)?$Swimlanes show who is responsible for each activity; but they are also helpful in identifying the activities that can cause delaysEach swimlane represent a set of operations that is performed by one user$/$group$/$systemAll the processes in different swimlanes can be executed paralelly.Swim lanes can only be arranged vertically.Fork node is used to bring back together a set of parallel or concurrent flows of activities