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When thinking about the elasticity of cloud architecture, it's useful to think more broadly than a single service or solution. Also remember, a key component of elasticity is the ability to automate scaling, which can be done in many different ways! The Elasticity concept of the AWS Well-Architected Framework discusses this more in depth.
Hi, above point is correct. Cloud Practitioner Certifications questions are typically broad, and so are the answers, which in this case entail more on the general elasticity concept rather than a specific use case of it.
Hope it helps ;)
AWS Certification questions often have, in addition to the correct answer, another answer that's not actually wrong but is clearly not as good. In this case as others pointed out the ELB answer is too specific. I also think it wrongly implies the ELB is somehow directly involved in scaling other resources, not just scaling itself to support the scaling of other resources.
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To directly answer your question, your chosen answer is resource specific, while the correct answer relates directly to the broad principle of cloud elasticity.
Does only of those answers fit the question though?
Yes, the correct answer, which is related to the concept of elasticity, is right. Sometimes when you see answers, they really look right, because if the question were worded slightly differently, it WOULD be right.