Atabasiclevel,cloudcomputingissimplyameansofdeliveringITresourcesas().AlmostallITresourcescanbedeliveredasacloudservice:applications,computepower,storagecapacity,networking,programmingtools,evencommunicationservicesandcollaboration().Cloudcomputingbeganaslarge-scaleInternetserviceproviderssuchasGoogle,Amazon,andothersbuiltouttheirinfrastructure.Anarchitectureemerged:massivelyscaled,()distributedsystemresources,abstractedasvirtualITservicesandmanagedascontinuouslyconfigured,pooledresources.Inthisarchitecture,thedataismostlyresidenton(请作答此空)"somewhereontheInternet"andtheapplicationrunsonboththe"cloudservers"andtheuser'sbrowser.Bothcloudsandgridsarebuilttoscalehorizontallyveryefficiently.Botharebuilttowithstandfailuresof()elementsornodes.Botharechargedonaper-usebasis.Butwhilegridstypicallyprocessbatchjobs,withadefinedstartandendpoint,cloudservicescanbecontinuous.What'smore,cloudsexpandthetypesofresourcesavailable——filestorage,databases,andWebservices——andextendtheapplicabilitytoWebandenterpriseapplications.
A.clients B.middleware C.servers D.hard disks正确答案C