Your company is currently hosting a long-running heavy load application on its On-premise environment. The company has developed this application in-house. Consulting companies then use this application via API calls, and each API call may take half an hour to finish. You now need to consider moving this application to AWS. Which of the following services would be best suited in the architecture design, which would also help deliver a cost-effective solution? Choose 2 answers from the options given below.

Answer options:

A.AWS Lambda
B.AWS API Gateway
C.AWS Config
D.AWS EC2

Answer – B and D
Option A might be a valid choice, but the question specifies heavy load application, leading to a need for time-out of API greater than 15min. As per AWS documentation, AWS Lambda can handle a max time-out of up to 15 minutes. In this case, the application may take more time to run.
Option B is correct because Amazon API Gateway is a fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale. With a few clicks in the AWS Management Console, you can create an API that acts as a “front door” for applications to access data, business logic, or functionality from your back-end services, such as workloads running on Amazon Elastic Compute Cloud (Amazon EC2), code running on AWS Lambda, or any web application.
Option C is incorrect since this is a configuration service available from AWS.
Option D is correct because EC2 would fit for using API calls for the application. For more information on AWS EC2 and the API gateway, please refer to the below URLs-
https://aws.amazon.com/api-gateway/
https://aws.amazon.com/ec2