You want to store critical business information in Cloud Storage buckets. The information is regularly changed, but previous versions need to be referenced on a...

You want to store critical business information in Cloud Storage buckets. The information is regularly changed, but previous versions need to be referenced on a regular basis. You want to ensure that there is a record of all changes to any information in these buckets. You want to ensure that accidental edits or deletions can be easily rolled back.
Which feature should you enable?

A. Bucket Lock B. Object Versioning C. Object change notification D. Object Lifecycle Management