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AWS Certified Solutions Architect - Professional · AWS
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
Answer is B
B is correct because it follows rightsizing best practices: choosing an instance type that matches the actual CPU and memory usage. This directly lowers cost and increases utilization, while requiring the least ongoing configuration changes.
With EC2 Attribute-based Instance Selection (ABIS), you can: Define desired vCPU, memory, and other instance characteristics (e.g., architecture, burstable/non-burstable). Let EC2 automatically choose instance types that match those attributes. Auto Scaling automatically selects the best available instance type, considering price and availability. This eliminates the need to manually maintain a list of instances — it adapts as AWS adds or removes instance types. ✅ Least configuration maintenance. ✅ Improves cost-efficiency. ✅ Improves resilience to Spot or On-Demand availability changes.