Final answer:
Kinesis Data Firehose is priced based on ingested data volume, data retrieval volume, and the size of each record.
Step-by-step explanation:
The correct answer is (D) All of the above. Kinesis Data Firehose is priced based on three factors: ingested data volume (per GB ingested), data retrieval volume (per GB of data retrieved), and the size of each record (per record, rounded up to the nearest 5KB). This pricing structure allows for flexibility depending on the specific use case and usage patterns.