You are using a 10-Gbps direct peering connection to Google together with the gsutil tool to upload files to Cloud Storage buckets from on-premises servers. The on-premises servers are 100 milliseconds away from the Google peering point. You notice that your uploads are not using the full 10-Gbps bandwidth available to you. You want to optimize the bandwidth utilization of the connection. What should you do on your on-premises servers? 

Answer options:

A. Tune TCP parameters on the on-premises servers. 
B. Compress files using utilities like tar to reduce the size of data being sent. 
C. Remove the -m flag from the gsutil command to enable single-threaded transfers.
D. Use the perfdiag parameter in your gsutil command to enable faster performance: gsutil perfdiag gs://[BUCKET NAME].

A