AWS Arch Pillars; Cost Optimization VS Performance Efficiency

[SeanB]

I’m struggling with this one. The question asks “Which AWS well-architected pillar stresses the importance of selecting the most appropriate and right number of resource types for your requirements?”

And this just screams performance efficiency to me. Even the explanation under performance efficiency states “…Key topics include selecting the right resource types and sizes based on workload requirements…”

What am I misunderstanding?

[Gerome-TutorialsDojo]

Hi SeanB,

Thanks for bringing up the question.

Cost Optimization – right number of resource types.
Performance Efficiency – right resource types and sizes based on workload.

Based on the screenshot that you’ve given, the question is asking for the most appropriate and right number of resource types which is the Cost Optimization pillar. The question is referenced from the AWS documentation, that is found here:
https://docs.aws.amazon.com/managedservices/latest/appguide/well-architected-aog.html

Let us know if you need further assistance. The Tutorials Dojo team is dedicated to helping you pass your AWS exam on your first try!

Regards,
Gerome @ Tutorials Dojo