Cloudcomputingisaphraseusedtodescribeavarietyofcomputingconceptsthatinvolvealargenumberofcomputers__请作答此空__throughareal-timecommunicationnetworksuchastheInternet.Inscience,cloudcomputingisa___72___fordistributedcomputingoveranetwork,andmeansthe___73___tor

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Cloudcomputingisaphraseusedtodescribeavarietyofcomputingconceptsthatinvolvealargenumberofcomputers__请作答此空__throughareal-timecommunicationnetworksuchastheInternet.Inscience,cloudcomputingisa___72___fordistributedcomputingoveranetwork,andmeansthe___73___torunaprogramorapplicationonmanyconnectedcomputersatthesametime. Thearchitectureofacloudisdevelopedatthreelayers:infrastructure,platform,andapplication.Theinfrastucturelayerisbuiltwithvirtualizedcomputestorageandnetworkresources.Theplatformlay-erisforgeneral-purposeandrepeatedusageofthecollectionofsoftwareresources.TheapplicationlayerisformedwithacollectionofallneededsoftwaremodulesforSaaSapplications.Theinfrastucturelayerservesasthe___74___forbuildingtheplatformlayerofthecloud.Inturn,theplatformlayerisfounda-tionforimplementingthe___75___layerforSaaSapplication.

A.connected
B.implemented
C.optimized
D.virtualized
正确答案A
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