16Swimlanes in an activity diagram show:ALoopsBWhich actor or unit performs each activityCData typesDInheritanceView AnswerDiscussWorkspaceReportSaveEasy
17In a sequence diagram, a lifeline represents:AA loopBA databaseCA class attributeDAn object or participant over timeView AnswerDiscussWorkspaceReportSaveEasy
18A component diagram shows:AObject messages over timeBUser actionsCSoftware components and their interfaces and dependenciesDHardware onlyView AnswerDiscussWorkspaceReportSaveEasy
19In a use case diagram, an actor is drawn as a:ADiamondBRectangleCCylinderDStick figureView AnswerDiscussWorkspaceReportSaveEasy