A government agency with strict security rules builds its own data center using cloud technologies. What deployment model is this?

This scenario describes a private cloud. A private cloud is a cloud computing environment dedicated exclusively to a single organization. The organization owns and operates the infrastructure, giving them complete control over security, compliance, and customization, which is crucial for agencies with strict security rules. Public cloud involves services offered over the public internet by third-party providers, which wouldn't meet the strict security and control requirements. Hybrid cloud combines public and private clouds, but the core characteristic here is the agency building its own data center. Multi-cloud uses multiple public cloud providers, which also doesn't fit the description of building a dedicated, owned infrastructure.