A,B seem to be correct. Reference: https://support.citrix.com/article/CTX225371 - Install apps from a share or an ISO versus downloading them to the desktop to keep layer size to a minimum. - Turn off automatic updates for applications. If automatic updates are left on, the updates will be put into the personalization layer. -- If this happens, you can use the “reinstall” feature to take back control of the application, and clearing the personalization layer of these conflicts/updates. - When installing an application that requires being part of a domain, it is ok to add the installation machine to the domain. -- After installing the application, remove the installation machine from the domain. -- Clean up the left over computer object in active directory - Installation machines can be added to View pools. Remember to remove them before finalizing the layer. This will prevent View certificate information from being saved in the layer.

Citrix Leading Practices for App Layers: • Install from an ISO or a share. • Turn off automatic updates. • Observe the layer status before publishing. • Remember apps can cross-talk between layers after publishing.

Should be A and B

B. Applications should be installed onto the packaging machine from an ISO or a fileshare location: When creating application layers, it's recommended to install applications onto the packaging machine from an ISO or a fileshare location. This helps in ensuring that the application layer is clean and isolated from other system changes. It also facilitates consistency in the layer creation process. E. Cross-talk between application layers is NOT supported after they are published in Citrix App Layering:

I think A&B are correct

Should be AE. Hypervisor tools should be installed on OS layer. Communication between layers is dependent on prerequisite layer and this one cannot be changed after publishing app layer.