You are building a pipeline to process time-series data. Which Google Cloud Platform services should you put in boxes 1,2,3, and 4? 

Answer options:

A. Cloud Pub/Sub, Cloud Dataflow, Cloud Datastore, BigQuery
B. Firebase Messages, Cloud Pub/Sub, Cloud Spanner, BigQuery
C. Cloud Pub/Sub, Cloud Storage, BigQuery, Cloud Bigtable
D. Cloud Pub/Sub, Cloud Dataflow, Cloud Bigtable, BigQuery

D

Reference: https://cloud.google.com/solutions/correlating-time-series-dataflow