Answer-first summary for fast verification
Answer: Lambda@Edge functions are only supported in specific Regions, such as us-east-1.
The reason for this failure is that Lambda@Edge functions must be created in the us-east-1 Region. The developer attempted to deploy the AWS SAM template in the eu-west-1 Region, but Lambda@Edge functions are not supported in that region. Hence, the correct answer is B.
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Why does the AWS SAM template deployment fail when including Lambda@Edge and resources in the eu-west-1 Region?
A
The misconception that CloudFront distributions are restricted to the us-east-1 Region.
B
Lambda@Edge functions are only supported in specific Regions, such as us-east-1.
C
The incorrect belief that AWS SAM templates cannot define multiple Lambda functions.
D
The requirement for the CloudFront distribution and S3 bucket to be in the same Region.