Which condition prevents deleting a VNF image from the software repository?

A VNF image cannot be deleted from the software repository if it is currently referenced by a service chain. This is a crucial dependency to prevent service disruptions. If the image were deleted while in use, the service chain relying on it would fail, impacting network functionality. The other options are incorrect: vManage stores all images in the repository, so this is not a condition that prevents deletion. An image being included in a configured policy does not prevent its deletion from the repository itself, though deleting it might break the policy. The method of upload (e.g., by a WAN Edge device) does not dictate deletion restrictions; the critical factor is whether the image is actively in use.