The correct choice is Instance Store. This option provides ephemeral local block storage that is attached to the host and is intended for fast per instance scratch space and caches that can be discarded when the instance stops or is terminated.

Instance Store delivers very low latency and high throughput because the storage is physically local to the host. That makes it ideal for temporary caches and scratch files that do not need to survive instance stops or terminations. The ephemeral nature aligns with workloads that can tolerate data loss on instance failure or shutdown.

Amazon Elastic File System (Amazon EFS) is a managed network file system that is designed for shared, elastic file storage across multiple instances and not for ultra low latency local caching on a single instance.

Amazon FSx for Lustre provides high performance for compute intensive workloads and can integrate with object storage, but it is network attached and does not offer the ephemeral, physically local disk tied to a specific instance lifecycle.

Amazon Elastic Block Store (Amazon EBS) is durable network attached block storage that persists independently of the instance and supports snapshots and recovery, which makes it unnecessary overhead for short lived per instance caches that can be discarded.

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