You are the primary technical resource for a Microsoft Dynamics CRM 2016 on-premises installation. While completing the discovery phase, you find that the domain is running directory service forest…

You are the primary technical resource for a Microsoft Dynamics CRM 2016 on-premises installation. While completing the discovery phase, you find that the domain is running directory service forest and domain functional level of Windows Server 2003. When you report your findings, you are informed that the organization is running legacy applications and could not upgrade functional levels when they began upgrading their servers several years ago. They understand that the software vendor has made updates and will investigate if new domain service functional levels are supported. You need to inform them of the minimally supported Active Directory Domain Services (AD DS) functional level for Microsoft Dynamics CRM 2016 on-premises. What is the minimally supported AD DS functional level?