Answer: Evaluate and adjust the write capacity units (WCUs) for the DynamoDB tables., Configure a dead letter queue that will reprocess failed or timed-out Lambda functions.

B: Evaluate and adjust the write capacity units (WCUs) for the DynamoDB tables. When thousands of users are interacting with your application simultaneously, it can generate a high volume of writes to the DynamoDB tables. If the provisioned write capacity units (WCUs) are insufficient, you will experience throttling, which can lead to delays and performance issues. By adjusting and increasing the WCUs, you can ensure that DynamoDB can handle the higher write throughput, thereby improving performance and mitigating one of the causes of execution issues in the AWS Lambda functions. D: Configure a dead letter queue that will reprocess failed or timed-out Lambda functions. Configuring a dead letter queue (DLQ) is a best practice to enhance the reliability of Lambda functions. A DLQ allows you to capture and store events that failed to process successfully. By reprocessing these failed or timed-out events, you can ensure that transient issues or errors do not result in lost data or unprocessed transactions. This helps in making the application more resilient and reliable, as it provides a mechanism to handle failures gracefully and retry operations as needed.

Author: LeetQuiz Editorial Team