A developer is building a solution to give an application that runs on an ecommerce...

The correct answer is C because Amazon SNS FIFO topics are designed for applications that require both message ordering and deduplication , and high throughput mode extends the throughput capability to support large-scale workloads such as sending thousands of notifications per second . This directly matches the requirement for ordered notification delivery at very high scale.

The requirement to filter out some notifications before sending them to the HTTP endpoint is also handled natively by SNS subscription filter policies . With a filter policy, only messages with matching message attributes are delivered to the subscribed endpoint. This means the application can publish all notification events to the SNS topic, while SNS ensures that only relevant notifications are forwarded to the HTTP subscriber. This avoids unnecessary downstream traffic and reduces custom logic.

Option A is incorrect because Amazon Data Firehose is intended primarily for streaming data delivery to analytics and storage destinations, not for ordered notification delivery to HTTP endpoints with filtering requirements. Option B is incorrect because Amazon SQS standard queues do not preserve strict ordering . Also, this design adds Lambda processing complexity and does not align as cleanly with native FIFO and filtering capabilities. Option D is not the best choice because EventBridge supports filtering and API destinations, but it does not provide the same straightforward FIFO ordered delivery guarantee required here.

Therefore, Amazon SNS FIFO in high throughput mode with an HTTP subscription and subscription filter policy is the AWS service combination that best satisfies all the stated requirements.