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Which AWS feature scales an EC2 fleet up or down based on CloudWatch-metric targets (e.g. avg CPU at 60%)?

AManually launching instances during peak
BAmazon RDS
CAmazon Route 53
DEC2 Auto Scaling groups with target tracking scaling policies
Answer & Solution
Correct answer: D. EC2 Auto Scaling groups with target tracking scaling policies
EC2 ASG + target-tracking is the canonical reactive scaling pattern (per DOP-C02 §3.2). Manual launches don't scale; RDS/Route 53 aren't autoscalers.
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