Your company needs to upload their historic data to Cloud Storage. The security rules don't allow access from external IPs to their on-premises resources. After an initial upload, they will add new data from existing on-premises applications every day. What should they do?

A. Execute gsutil rsync from the on-premises servers. B. Use Dataflow and write the data to Cloud Storage. C. Write a job template in Dataproc to perform the data transfer. D. Install an FTP server on a Compute Engine VM to receive the files and move them to Cloud Storage.