An online gaming company needs to rehost its gaming platform on AWS.

C is correct because the existing workload already uses a compute optimized EC2 instance for HPC-style processing, so the closest performance-optimized rehost is an Auto Scaling group of compute optimized On-Demand instances behind an Application Load Balancer. On-Demand instances avoid Spot interruption risk, which is important when the requirement emphasizes performance rather than cost reduction. The application currently uses Redis for application state and a frequently updated leaderboard, so Amazon ElastiCache for Redis OSS is the managed AWS replacement. AWS documentation identifies Redis OSS sorted sets as a direct pattern for gaming leaderboards and describes ElastiCache as a Redis-compatible in-memory service with low-latency performance. OpenSearch is for search and analytics, not high-speed leaderboard state. DynamoDB can support ranking patterns but is not the direct Redis-compatible migration target.