Explanation:
Box 1: Windows Server Update Services (WSUS)
Windows Server Update Services (WSUS) enables information technology administrators to deploy the latest Microsoft product updates. You can use WSUS to fully manage the distribution of updates that are released through Microsoft Update to computers on your network.
Windows Server Update Services is a built-in server role that includes the following enhancements:
Can be added and removed by using the Server Manager
Includes Windows PowerShell cmdlets to manage the most important administrative tasks in WSUS Etc.
Box 2: A Group Policy object
In an Active Directory environment, you can use Group Policy to define how computers and users can interact with Windows Update to obtain automatic updates from Windows Server Update Services (WSUS).
Box 3: BranchCache
BranchCache is a bandwidth-optimization feature that has been available since the Windows Server 2008 R2 and Windows 7 operating systems. Each client has a cache and acts as an alternate source for content that devices on its own network request. Windows Server Update Services (WSUS) and Microsoft Endpoint Manager can use BranchCache to optimize network bandwidth during update deployment, and it's easy to configure for either of them. BranchCache has two operating modes: Distributed Cache mode and Hosted Cache mode.
Reference: https://docs.microsoft.com/en-us/windows/deployment/update/waas-branchcache
https://docs.microsoft.com/en-us/windows-server/administration/windows-server-update-services/deploy/4-confi