Deploying a Globally Available Mission-Critical Application

Answer - D.

Regions represent different geographical locations and are suitable for hosting your application across multiple regions for disaster recovery.

For more information on AWS Regions, please refer to the below URL:

To ensure global availability for a mission-critical application, the recommended deployment mechanism is to deploy the application to multiple AWS Regions.

AWS Regions are separate geographic areas with multiple Availability Zones in each region. Each Availability Zone is an isolated location with its own power, cooling, and networking facilities, designed to be highly available and fault-tolerant. Deploying an application across multiple regions can help ensure that the application is available even if one or more regions experience a service outage or disaster.

Option A, deployment to multiple edge locations, is not the best choice for global availability because edge locations are designed to cache content and reduce latency for end-users accessing content. Edge locations are not designed for high availability or fault tolerance.

Option B, deployment to multiple Availability Zones, is a good option for high availability within a single region, but it does not provide global availability. While deploying an application across multiple Availability Zones can help ensure availability in the event of an outage in one Availability Zone, it does not provide redundancy across multiple regions.

Option C, deployment to multiple data centers, is similar to option D, deployment to multiple regions. However, deploying an application across multiple data centers typically requires significant upfront capital investment and ongoing maintenance costs, whereas deploying an application across multiple AWS Regions is a more cost-effective and scalable option.

Therefore, the correct answer is D, deployment to multiple Regions, to ensure global availability for a mission-critical application.