DVA-C02 · Question #237
DVA-C02 Question #237: Real Exam Question with Answer & Explanation
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Question
A developer is designing a serverless application that customers use to select seats for a concert venue. Customers send the ticket requests to an Amazon API Gateway API with an AWS Lambda function that acknowledges the order and generates an order ID. The application includes two additional Lambda functions: one for inventory management and one for payment processing. These two Lambda functions run in parallel and write the order to an Amazon Dynamo DB table. The application must provide seats to customers according to the following requirements. If a seat is accidently sold more than once, the first order that the application received must get the seat. In these cases, the application must process the payment for only the first order. However, if the first order is rejected during payment processing, the second order must get the seat. In these cases, the application must process the payment for the second order. Which solution will meet these requirements?
Options
- ASend the order ID to an Amazon Simple Notification Service (Amazon SNS) FIFO topic that fans
- BChange the Lambda function that generates the order ID to initiate the Lambda function for
- CSend the order ID to an Amazon Simple Notification Service (Amazon SNS) topic. Subscribe the
- DDeliver the order ID to an Amazon Simple Queue Service (Amazon SQS) queue. Configure the
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