Which AWS solution should the company use to meet these requirements?

Explanations:

Amazon RDS with a single Availability Zone does not provide high availability or fault tolerance, as it is limited to a single zone and can be affected by zone failures.

Amazon RDS snapshots are used for backup and recovery, but they do not ensure high availability or fault tolerance in real-time operations.

Amazon RDS with multiple Availability Zones provides high availability and automatic failover capabilities, ensuring that the database remains operational even if one Availability Zone fails.

AWS Database Migration Service (AWS DMS) is designed for database migration, not for providing high availability or fault tolerance for a running database instance.