When authoring an AWS CloudFormation template, what is the most operationally efficient way to obtain the AWS Region where the template is being deployed?
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Correct answer: Use the AWS::Region pseudo parameter..
Why this is the answer
The AWS::Region pseudo parameter is the most operationally efficient way to obtain the AWS Region. CloudFormation automatically populates this parameter with the current Region where the stack is being deployed, requiring no additional configuration or runtime calls. Requiring the Region as an input parameter adds an unnecessary manual step for users. Extracting the Region from AWS::StackId using Fn::Split is overly complex and less direct than AWS::Region. Dynamically retrieving the Region from Systems Manager Parameter Store introduces an external dependency and additional cost, making it less efficient for this common task.
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