Correct Answer: Option 1

Option 1 is the correct and most appropriate choice. Amazon SQS FIFO (First-In-First-Out) queues are specifically designed to preserve the exact order of message delivery, which is critical in this scenario. When paired with a Lambda function, this setup allows for event-driven processing while minimizing operational overhead. The FIFO queue ensures strict ordering, and Lambda scales automatically with the incoming workload, satisfying both the ordering and low-maintenance requirements.

Why the other options are incorrect:

Option 2: SNS does not guarantee message order and lacks durable retry logic for failed Lambda executions.
Option 3: SQS standard queues do not preserve message order and may deliver messages out of sequence.
Option 4: SNS cannot publish to FIFO queues, and the combination does not guarantee message ordering.

Why this question is challenging: It tests knowledge of message ordering, service integration, and managed event-driven architecture.

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