Option b) redis is an in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
A key-value database is known to be a kind of nonrelational database that is known to often make use of a simple key-value method to save data.
Note that A key-value database saves data as a set of key-value pairs and it is onw where a key is used as a unique identifier. Note that the 2 keys and values can be seen as anything, such as simple objects or complex compound objects.
Hence, Option b) redis is an in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
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