A developer needs to build an AWS CloudFormation template that self-populates the AWS Region variable that deploys the CloudFormation template.
What is the MOST operationally efficient way to determine the Region in which the template is being deployed?

A. Use the AWS::Region pseudo parameter.
B. Require the Region as a CloudFormation parameter.
C. Find the Region from the AWS:StackId pseudo parameter by using the Fn::Split intrinsic function.
D. Dynamically import the Region by referencing the relevant parameter in AWS Systems Manager Parameter Store.