Windows Server 2016 with 5 Cores.
Windows Server 2016 is the cloud-ready operating system that supports your current workloads while introducing new technologies that enable the transition to cloud computing when you're ready. The following information provides an overview of the editions and licensing options
Microsoft Windows Server 2016 10 RDS User CAL Remote Desktop Services 10 User
Microsoft Windows Server 2019 RDS 10 User CAL Remote Desktop Services 10 User
Windows Server 2019 is the cloud-ready operating system that supports your current workloads and introduces new technologies that make it easier to move to cloud computing when you're ready.
Windows Server Standard 2012 is the successor to Windows Server 2008 R2. As a server version for the Windows 8 operating system, Windows 2012 Server Standard offers you current features.