Which statement describes a key-value database?

Which statement describes a key-value database?
A . Each item in the database is stored as an attribute name (referred to as a key) with its corresponding value
B . Each item in the database is encrypted with public-key cryptography
C . Each item in the database is a document with lists of key-value pairs
D . Each item in the database is stored in a column named key with values in each row

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Answer: A