Which statement is true about Amazon ElastiCache?

Amazon ElastiCache is designed to provide in-memory caching capabilities, specifically supporting data structures and caching mechanisms offered by engines like Redis and Memcached. Utilizing ElastiCache enhances application performance by allowing frequently accessed data to be stored in memory, significantly reducing latency and improving read speeds.

By focusing on Redis and Memcached, ElastiCache enables developers to implement caching strategies that can manage dynamic web applications efficiently. Redis offers advanced features like data persistence, high availability, and low-latency access, while Memcached excels in its simplicity for caching pure key-value pairs.

The other answer choices do not accurately represent ElastiCache's functionalities or characteristics. For instance, ElastiCache is not limited to MySQL databases; it is agnostic of underlying database technologies and can cache data from various databases. It also streamlines server management, providing a managed service that reduces the overhead typically associated with running caching systems. Finally, ElastiCache is not a file storage service; its core purpose revolves around in-memory caching rather than file storage capabilities. Thus, the statement about ElastiCache managing in-memory caching for Redis and Memcached is accurate.