A payments company scores every card transaction with a fraud model hosted on a SageMaker AI real-time endpoint. The model needs a feature called txn_count_5min, the number of transactions on the same card in the previous five minutes. Transactions already arrive on an Amazon Kinesis data stream. The feature must be available to the scoring service within a few seconds of each transaction, and it is served from a feature group that has the online store enabled.
Which ingestion design meets the freshness requirement?