Where should the temporary files be stored?

Explanations:

The/tmpdirectory in AWS Lambda allows for the storage of temporary files with a maximum size of 512 MB. Since the developer’s requirements specify temporary files less than 10 MB that do not need to be saved after the invocation, the/tmpdirectory is the most appropriate option for storing these files during the function’s execution.

Amazon EFS is designed for persistent storage that can be accessed by multiple Lambda functions or EC2 instances. It is not optimized for temporary file storage for single function invocations, making it unnecessary and potentially more complex for this scenario.

Amazon EBS provides block-level storage for use with EC2 instances and is not suitable for use directly with Lambda functions. Additionally, it is intended for persistent data storage, which contradicts the requirement for temporary file usage.

Amazon S3 is an object storage service intended for durable and scalable storage. It is not suited for temporary file usage during a single Lambda invocation, as accessing and modifying files in S3 involves additional latency and is not ideal for transient data.