To add business apps to the Applications menu, you need to use the Content Manager tool, which is located in the Site Manager. The Content Manager includes various editors that you can use to configure apps, groups, roles, and catalogs1. You can add business apps from different sources, such as content channels or manually, and assign them to roles, groups, and catalogs2. You can also add the apps to the workpages of your site using the page designer widget gallery3. The Applications menu is a single page in SAP Build Work Zone, advanced edition, that displays the business apps as tiles that a user can launch2.
The other options are not correct, because:
Work Zone Configurator is a tool that allows you to create and manage SAP Build Work Zone, advanced edition sites, but it does not have the functionality to add business apps to the Applications menu.
Administration Console is a tool that allows you to manage the global settings and security of SAP Build Work Zone, advanced edition, but it does not have the functionality to add business apps to the Applications menu.
Channel Manager is a tool that allows you to create and manage content providers, which are sources of business apps and content, but it does not have the functionality to add business apps to the Applications menu. You need to use the Content Manager to add the apps from the content providers to your site.
References: 1: Content Manager | SAP Help Portal 2: Adding Apps to Your Site | SAP Help Portal 3: Add an SAPUI5 App to a Workpage in SAP Build Work Zone, advanced edition | SAP Developers : Work Zone Configurator | SAP Help Portal : Administration Console | SAP Help Portal : Federation of Remote Content Providers | SAP Help Portal