The correct answer is: A. managed
Managed cloud storage is a type of cloud storage that is fully managed by a cloud provider. This means that the provider is responsible for all aspects of the storage, including provisioning, configuration, maintenance, and security. Managed cloud storage is a good option for developers and businesses that need a reliable and scalable storage solution that they do not have to manage themselves.
Unmanaged cloud storage is a type of cloud storage that is not managed by a cloud provider. This means that the user is responsible for all aspects of the storage, including provisioning, configuration, maintenance, and security. Unmanaged cloud storage is a good option for developers and businesses that need a cost-effective storage solution that they can manage themselves.
Disk storage is a type of storage that uses physical disks to store data. Disk storage is a good option for storing large amounts of data that needs to be accessed frequently.
All of the mentioned are types of cloud storage. However, only managed cloud storage is mainly meant for developers and to support applications built using Web services.