A virtual hard disk (VHD). You can think of it like a physical disk in an on-premises server but, virtualized. Stored as page blobs, which are a random IO storage object in Azure. We call a ____________________ disk '__________' because it is an abstraction over page blobs, blob containers, and Azure storage accounts. All you have to do is provision the disk, and Azure takes care of the rest. When you select to use Azure __________ disks with your workloads, Azure creates and __________ the disk for you.