Which of the Following Statements Is True About Roles in a Business

Which of the following statements is true about roles in a business process?

A) A role is the superset of the activities in a business process.
B) Roles are grouped in swimlane diagrams according to the number of actors involved.
C) The name of a role is written at the top of a swimlane.
D) A particular role can be fulfilled by just one person.