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As a solutions architect, how should you design a multi-tier application to asynchronously process image uploads, generate thumbnails, and notify users of successful uploads within a 60-second thumbnail generation limit?
A
Implement AWS Lambda for thumbnail generation triggered by image uploads, alerting users upon completion.
B
Use AWS Step Functions to coordinate application tiers, ensuring user notification post-thumbnail generation.
C
Leverage Amazon SQS for queuing thumbnail generation tasks, with immediate user notification of image receipt.
D
Apply Amazon SNS for managing notifications, one for initiating thumbnail generation and another for user alerts post-generation.
