Final answer:
The alternative to using Lambda with DynamoDB Streams for real-time data processing is Kinesis Data Streams.
Step-by-step explanation:
The alternative to using Lambda with DynamoDB Streams for real-time data processing is Kinesis Data Streams. Kinesis Data Streams is a fully managed service by Amazon Web Services (AWS) that is specifically designed for ingesting, buffering, and processing large amounts of streaming data in real-time.
While Step Functions, S3 Buckets, and EC2 Instances are also AWS services, they do not provide the same real-time data processing capabilities as Lambda and Kinesis Data Streams.