A company provides an incentive to users who are physically active. The company wants to determine how active the users are by using an application on their mobile devices to track the number of…

Amazon Cognito is primarily for user authentication and management, not for direct data ingestion to a backend data store. DynamoDB is a NoSQL database, and while useful for fast access, building NRT analytics directly on it from a mobile app stream is less optimized than Kinesis.

While Amazon API Gateway can ingest data to Amazon DynamoDB, DynamoDB is a NoSQL database focused on low-latency item access. It is not as optimized or flexible as Kinesis Data Streams for general-purpose, high-throughput 'near-real-time analytics on live data' on streams of data with least operational overhead.

Using Amazon API Gateway provides a scalable, secure, and serverless endpoint for mobile applications to ingest live data. Amazon Kinesis Data Streams is purpose-built for high-throughput, real-time data ingestion and enables near-real-time analytics on live data with minimal operational overhead, after which the processed data can be stored for long-term analytics.

Amazon Kinesis Data Firehose delivers data to destinations like S3, but it typically buffers and delivers in batches, making it less suitable for 'near-real-time analytics on live data' compared to Kinesis Data Streams, which offers sub-second processing latency.