You plan to decommission a Shared VPC host project and remove its networks. Which sequence of actions ensures safe teardown without leaving broken attachments or routing?

The correct sequence ensures a clean and controlled teardown. First, detaching service projects prevents them from losing network connectivity abruptly and allows their resources to be reconfigured or deleted independently. Next, removing the Shared VPC association formally dissolves the host-service project relationship. Deleting peering connections and custom routes eliminates dependencies and prevents orphaned routing entries. Finally, deleting host project resources, including the VPC network itself, is safe because all dependencies have been removed. Deleting the host project first would immediately break connectivity for all attached service projects, leading to outages and complex recovery. Removing peering after host project deletion would leave dangling references. Disabling billing does not trigger automatic resource deletion.