I have developed an application using AWS services that have been deployed to multiple regions. How do I achieve the best Performance and Availability when users from different locations access my application?

Answer options:

A.Use Route 53 latency based routing for improving performance and Availability.
B.Use a CloudFront distribution for improving performance and Availability.
C.Use Global Accelerator for improving performance and Availability.
D.Use an endpoint of the application directly for accessing it that lies within a user’s Region.

Answer: C
Option A is incorrect. Route 53 latency-based routing helps select a region that may be relatively faster for the user to send traffic to based on certain factors like internet traffic and proximity to the user’s location. However, the actual route to the destination does not involve providing a fast network path for optimum performance, which is the prime requirement for the scenario. Latency based routing does not address Availability.
Option B is incorrect. CloudFront improves performance for both cacheable content (e.g., images, videos) and dynamic content (e.g., API, dynamic site delivery) using edge locations. Here we are talking about application performance & Availability with a highly reliable, performant network rather than bringing content closer to the user.
Option C is CORRECT. Global Accelerator improves the performance of a wide range of applications over TCP or UDP by proxying packets at Edge locations to applications running in one or more AWS regions. Global Accelerator provides static IP addresses acting as a fixed entry point to application endpoints (Application Load Balancers, EC2 instances ...) in a single or multiple AZ’s offering High Availability. It uses the AWS global network to optimize the path from users to the application, thus improving the resultant traffic performance by as much as 60%. It provides very low latency for a great user experience by
i). Routing traffic to the closest edge location through AnyCast & then routing it to the closest regional endpoint over the AWS global network.
ii). Good for Gaming, Media, Mobile applications.
Option D is incorrect since
The application may not be deployed in the Region that the user is trying to access.
There is no way to calculate latency even though there is proximity to the user’s region.
Availability will be restricted to AZ’s rather than Regions if regional endpoints, e.g., ELB’s are directly accessed.
References:
https://tutorialsdojo.com/aws-global-accelerator/
https://docs.aws.amazon.com/global-accelerator/latest/dg/what-is-global-accelerator.html