Your organization is running a Firestore-backed Firebase app that serves the same top ten news stories on a daily basis to a large global audience. You want to optimize content delivery while decreasing cost and latency. What should you do?

1. A. Enable serializable isolation in the Firebase app.
2. B. Deploy a US multi-region Firestore location.
3. C. Build a Firestore bundle, and deploy bundles to Cloud CDN.
4. D. Create a Firestore index on the news story date.

Correct Answer: C
A global audience strongly suggests serving content via Google’s Content Delivery Network. Changing the isolation level won’t decrease cost or latency

Your team recently released a new version of a highly consumed application to accommodate additional user traffic. Shortly after the release, you received an alert from your production monitoring team that there is consistently high replication lag between your primary instance and the read replicas of your Cloud SQL for MySQL instances. You need to resolve the replication lag. What should you do?

1. A. Identify and optimize slow running queries, or set parallel replication flags.
2. B. Stop all running queries, and re-create the replicas.
3. C. Edit the primary instance to upgrade to a larger disk, and increase vCPU count.
4. D. Edit the primary instance to add additional memory.

Correct Answer: A
https://cloud.google.com/sql/docs/mysql/replication/replication-lag#optimize_queries_and_schema