Which of the following describes the availability features of DynamoDB?

The correct choice accurately describes DynamoDB's availability features by highlighting that it offers automatic failover and replication across regions. This capability ensures that your data is not only highly available but also durable. With DynamoDB, if one region faces an outage, the system automatically fails over to another region where the data is replicated. This is part of the service's robust design, which helps maintain high availability and resilience for applications that demand consistent uptime.

DynamoDB is designed to operate with multi-region settings, allowing developers to architect their applications to handle regional disruptions efficiently. The replication feature ensures that users can access their data without significant downtime, essential for global applications or those needing disaster recovery strategies.

The other options do not accurately capture the comprehensive availability and durability features provided by DynamoDB. The mention of single-region availability overlooks key aspects of the service designed for high availability. Manual backup and recovery are not a requirement, as DynamoDB offers built-in mechanisms for backup and recovery, reducing the administrative burden on users. Lastly, the availability of the service is not limited to business hours; it is designed for continuous 24/7 access, allowing applications to function at any time.