Metadata is data about data. It contains information about the type of data, how it is stored and organized, or information about its creation and use.

The question is describing the Infrastructure as a Service (IaaS) cloud offering, and as such, the volume and object storage types will be available to the customer. Structured and unstructured are storage types associated with PaaS, and although the other answers present similar- sounding storage types, they are a mix of real and fake names.

With SaaS, the application is a shared responsibility between the cloud provider and cloud customer.
Although the cloud provider is responsible for deploying, maintaining, and securing the application, the cloud customer does carry some responsibility for the configuration of users and options. Regardless of the cloud service category used, the physical environment is always the sole responsibility of the cloud provider. With all cloud service categories, the data and governance are always the sole responsibility of the cloud customer.