Which of the following are the simplest NoSQL databases?
(a) Key-value
(b) Wide-column
(c) Document
(d) All of the mentioned
(a) Key-value
(b) Wide-column
(c) Document
(d) All of the mentioned
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The correct choice is (a) Key-value
For explanation: Every single item in the database is stored as an attribute name (or “key”), together with its value in Key-value stores.