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Which compute option scales to zero between requests and bills per invocation millisecond, making it cheap for spiky low-volume APIs?
AAmazon EC2 with Reserved Instances
BAWS Outposts
CAWS Lambda
DAmazon EMR clusters
Answer & Solution
Correct answer: C. AWS Lambda
Lambda scales from 0 to high concurrency and bills per ms of execution time. Reserved EC2 is always on (pays even when idle). Outposts are physical racks; EMR is a long-lived Hadoop cluster.
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