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Identify the missing word(s) in the following sentence within the context of Microsoft Azure. Azure Infrastructure as a Service (IaaS) solutions are frequently used when migrating your on-premises environment to the cloud. There are several tools available to help with the migration process. Platform as a Service (PaaS) provides a complete development and deployment environment in the cloud, which can be used for simple cloud-based applications as well as for advanced enterprise applications. PaaS comes in several different service tiers. Each tier has varying capabilities, which provide a wide range of options when choosing this platform. [?] are built on top of the technology used in geo-replication, but provide a single endpoint for connection. The major reason for using failover groups is that the technology provides endpoints, which can be utilized to route traffic to the appropriate replica.