Server1 hosts an on-premises MDT deployment share (MDT1). To enable MDT1 to support multicast deployments, which Windows role or service must be installed on Server1?

Windows Deployment Services (WDS) is the correct answer because it provides the network boot (PXE) and multicast capabilities essential for deploying operating systems over the network, which MDT leverages. Multicast deployments, specifically, require WDS to efficiently send a single stream of data to multiple clients simultaneously, reducing network traffic. Multipath I/O (MPIO) is incorrect as it's used for managing multiple paths to storage devices, not for network deployments. Multipoint Connector is incorrect; it's related to Windows MultiPoint Server, which allows multiple users to share one computer, and has no bearing on OS deployment. Windows Server Update Services (WSUS) is incorrect because it manages and distributes software updates, not operating system images for initial deployment.