Regardless of how wellDesigned,Constructed,And testedA system orApplication mayBe, errors orBugs will inevitably occur. OnceA system hasBeen（  ），it enters operationsAnd support.
Systems support is the ongoing technical support for user,As wellAs the maintenance required to fixAny errors, omissions,or new requirements that mayArise.BeforeAn information systemCanBe（  ）, it mustBe in operation. System operation is theDay-to-day, week-to-week, month-to-month,And year-t-year（  ）ofAn information system'sBusiness processesAndApplication programs.
Unlike systemsAnalysis,Design,And implementation, systems supportCannot sensiblyBe（  ）intoActual phases thatA support project must perform. Rather, systems supportConsists of four ongoingActivities thatAre program maintenance, system recovery, technical support,And system enhancement.EachActivity isA type of support project that is（  ）byA particular problem,event, or opportunity encountered with the implemented system.
1)A.designed
B.implemented
C.investigated
D.analyzed
2)A.supported
B.tested
C.implemented
D.constructed
3)A.construction
B.maintenance
C.execution
D.implementation
4)A.broke
B.formed
C.composed
D.decomposed
5)A.triggered
B.leaded
C.caused
D.produced