The correct answer is B. An Amazon Aurora global database with a warm standby deployment meets the requirements while offering the lowest recovery time objective (RTO). Aurora global databases are designed for high availability and low-latency global access. A warm standby strategy ensures that the secondary region is ready to take over quickly in case of a failure in the primary region, leading to a lower RTO compared to other strategies. This setup allows the database to be up to date with minimal latency and allows the rest of the infrastructure to run on reduced capacity while still being able to scale up when necessary.