Atabasiclevel,cloudcomputingissimplyameansofdeliveringITresource

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

A.hardware

B.computers

C.services

D.software

正确答案是C