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Block storage in the cloud (e.g. AWS EBS, Azure Managed Disks, GCP Persistent Disk) is best characterised as:
AVolume-based storage that is attached to a single VM at a time and presented to it as a local block device
BAn object store accessed only via HTTP REST APIs
CA managed relational database engine
DA serverless message bus
Answer & Solution
Correct answer: A. Volume-based storage that is attached to a single VM at a time and presented to it as a local block device
Block storage = a virtual disk attached to one VM (or to a few, with shared-attachment options) accessed via SCSI/NVMe-like block I/O. Object stores (S3, GCS, Blob Storage) sit at a higher abstraction over HTTP. Databases and message buses are separate categories.
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