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AWS Certified Solutions Architect - Professional · AWS
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the question stresses high-performance compute and fast-changing leaderboard. C5 instances (compute optimized) with On-Demand reliability meet the HPC requirement, and ElastiCache for Redis is the AWS-native solution for real-time leaderboards. A and D use the wrong instance family, B uses the wrong data store, and Spot Instances (A, B) are not reliable enough for a gaming platform.
D is the write answer
Answer: C B/c: not use spot instance