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Which AWS pattern lets an HTTP API handle 10× traffic spikes WITHOUT provisioning EC2 capacity ahead of time?
AEC2 m5.large instances with Reserved Instance commitments
BAmazon API Gateway → AWS Lambda (serverless API with auto-scaling)
CAWS Outposts deployed in the customer's office
DAmazon ECS on EC2 launch type with manual scaling
Answer & Solution
Correct answer: B. Amazon API Gateway → AWS Lambda (serverless API with auto-scaling)
API Gateway + Lambda is the canonical serverless API pattern — concurrency scales without VM management. Reserved EC2 / manual ECS scaling don't absorb 10× bursts without manual prep. Outposts are on-prem racks.
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