You are working with a Cloud SQL MySQL database at your company. You need to retain a month-end copy of the database for three years for audit purposes. What should you do? 

Answer options:

A. Set up an export job for the first of the month. Write the export file to an Archive class Cloud Storage bucket.
B. Save the automatic first-of-the-month backup for three years. Store the backup file in an Archive class Cloud Storage bucket.
C. Set up an on-demand backup for the first of the month. Write the backup to an Archive class Cloud Storage bucket.
D. Convert the automatic first-of-the-month backup to an export file. Write the export file to a Coldline class Cloud Storage bucket.

B