Your application deployed in GKE has started experiencing latency issues. You have identified the need to add a caching layer. What is the most cost-effective yet high-performance caching solution that also supports data eviction policies?

*Explanation:* Option C, using Cloud MemoryStore with Redis, is the most cost-effective and high-performance caching solution that also supports data eviction policies. Cloud MemoryStore provides a fully managed caching service with Redis, offering low-latency access to cached data and the ability to configure data eviction policies. This solution helps improve application performance by reducing latency and ensures efficient use of resources without the complexity of building your own caching mechanism.