Which AWS service can be used to automatically scale an application up and down without making capacity planning decisions?
A. Amazon AutoScaling
B. Amazon Redshift
C. AWS CloudTrail
D. AWS Lambda
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D is correct.
“Combine AWS Lambda with other AWS services to build powerful web applications that automatically scale up and down and run in a highly available configuration across multiple data centers.”
https://aws.amazon.com/lambda/
Keep in mind “Amazon AutoScaling” do scale an application “IN” & “OUT” (Horizontal Scalling) . And AWS Lambda do Scale application “Up” & “Down” (Vertical Scaling) .
option A is correct