Question: In a key - value pair system, what does the key represent? The value associated with a particular data entry The type of data stored

In a key-value pair system, what does the "key" represent?
The value associated with a particular data entry
The type of data stored within the value
A unique identifier used to retrieve the associated value
The size limit for the stored data
In a key - value pair system, what does the "key"

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