You are tasked with updating the code for a subscriber within a Google Cloud Pub/Sub architecture. The subscriber currently processes incoming messages from a Pub/Sub topic. However, there is a concern that during deployment, the subscriber may inadvertently acknowledge messages before they have been properly processed, resulting in potential message loss. Currently, the system is configured such that once messages are acknowledged, they are not retained. What steps should be taken to ensure error recovery and prevent message loss during and after the deployment process? | Google Professional Data Engineer Quiz