The multi-version control function of object storage OBS is enabled for the entire bucket. The multi- version control function cannot be enabled for a folder or file in the bucket.

Which of the following are features of Huawei Cloud Object Storage Service OBS? (Multiple choice)

When switching the operating system of an elastic cloud server purchased using the
"annual/monthly package" method, switching from a free operating system to another free operating system is not supported.

Huawei Cloud's load balancing provides traffic distribution services for multiple cloud servers, supporting layer 4 and layer 7 traffic forwarding, where layer () traffic forwarding is based on identifying relevant fields in the HTTP/HTTPS protocol message header.

When Huawei Cloud tenants use the object storage service OBS, if they want to retain multiple versions of an object, which of the following methods can be used to achieve this?