A development team is building an ecommerce application and is using Amazon Simple Notification Service (Amazon SNS) to send order messages to multiple endpoints. One of the endpoints is an external HTTP endpoint that is not always available. The development team needs to receive a notification if an order message is not delivered to the HTTP endpoint. What should a DevOps engineer do to meet these requirements?

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A. Create an Amazon Simple Queue Service (Amazon SQS) queue. On the SNS topic, configure a redrive policy that sends undelivered messages to the SQS queue. Create an Amazon CloudWatch alarm for the new SQS queue to notify the development team when messages are delivered to the queue.
B. Create an Amazon Simple Queue Service (Amazon SQS) queue. On the HTTP endpoint subscription of the SNS topic, configure a redrive policy that sends undelivered messages to the SQS queue. Create an Amazon CloudWatch alarm for the new SQS queue to notify the development team when messages are delivered to the queue. Most Voted
C. On the SNS topic, configure an HTTPS delivery policy that will retry delivery until the order message is delivered successfully. Configure the backoffFunction parameter in the policy to notify the development team when a message cannot be delivered within the set constraints.
D. On the HTTP endpoint subscription of the SNS topic, configure an HTTPS delivery policy that will retry delivery until the order message is delivered successfully. Configure the backoffFunction parameter in the policy to notify the development team when a message cannot be delivered within the set constraints.

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