AWS Certified Developer Associate DVA-C02 Practice Question

Using Amazon ElastiCache for Redis is the best option for temporary session-specific data storage for a stateless Lambda function. Redis provides fast, in-memory data storage and retrieval, which is ideal for the ephemeral nature of session data within a single game session, without persisting state in the Lambda function itself. Amazon DynamoDB would not be considered the best choice for this scenario as it is more suited for durable storage, and the speed and efficiency of in-memory caching are favorable for temporary session data during peak times. Using Lambda environment variables or writing data to Amazon EFS is incorrect because these would not allow Lambda to maintain statelessness, as environment variables are not meant for transaction-specific data, and EFS would introduce data persistence and cross-invocation state that violates stateless principles.