All these are defined in Work- class and all these are "Route" type Activities.

ToCreateOperator

Route the assignment to the user who entered the work object.

ToWorkbasket

Routes the assignment to a workbasket identified in a parameter.

Routes the assignment to the worklist of a specific user, identified in a parameter.

Routes the assignment to an available operator, chosen randomly, in the workgroup. If none are available, the assignment is routed to the manager.

Routes the assignment to the manager of current operator's workgroup

This activity gets executed through SLA. The activity reassigns the work item to a workbasket.