Answer: Cloud Bigtable

The correct choice is **C. Cloud Bigtable**, as it is specifically optimized for high-speed operations on large-scale, time-stamped data like IoT streams. It's a fully managed, scalable NoSQL database capable of handling from 1TB to hundreds of petabytes efficiently. - **Why not A?** Cloud Storage is ideal for object storage but not suited for rapid data ingestion and modification. - **Why not B?** BigQuery excels as a data warehouse solution but isn't designed for fast-changing data scenarios. - **Why not D?** Cloud Datastore lacks the performance needed for frequent writes or time-based queries on large datasets.

Author: LeetQuiz Editorial Team