Discussion
Object storage differs from block storage in that objects are
Answer: A
Correct answer: addressed by key and replaced whole
An object store is a flat namespace of keys mapping to blobs, and an object is written or replaced in its entirety rather than edited in place. Block storage presents raw blocks that a filesystem addresses by offset and modifies individually. That single difference explains everything else: object stores scale almost without limit and are reached over HTTP, but they cannot serve as the disk under a database.
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