Which of the following options allows for an application to be deployed across multiple regions?

Deploying an application across multiple regions enhances its availability and performance by leveraging geographically distributed infrastructure. AWS Global Accelerator is specifically designed for this purpose. It optimizes the route to your application endpoints across multiple regions by using the AWS global network, improving the latency for users and providing improved reliability.

AWS Global Accelerator operates by providing a single static IP address that serves as a fixed entry point to your application, enabling seamless redirection to the optimal regional endpoint based on health, geography, and routing policies. This is essential for applications that require cross-region deployment because it allows for efficient management and routing of traffic to various endpoints that might be spread across different geographical locations.

In contrast, while Amazon RDS can be deployed in multiple availability zones within a region for high availability, it does not automatically manage global traffic. CloudFormation is a service for defining and deploying infrastructure as code, but it does not inherently direct traffic across regions. Elastic Load Balancer can distribute incoming application traffic across multiple targets in a single region, but it does not support cross-region load balancing natively. Therefore, AWS Global Accelerator is the most suitable service for allowing applications to seamlessly deploy and operate across multiple regions.