Which of the following correctly defines cipher text?

Cipher text refers to data that has undergone encryption to protect its contents from unauthorized access. It is not human-readable and is transformed through specific algorithms and keys to secure the information it contains. The primary purpose of cipher text is to ensure that only those who possess the correct decryption key can convert it back into its original, readable format, known as plain text.

The other options do not accurately reflect the definition of cipher text. For instance, human-readable text refers to information that can be easily understood and is not encrypted. Plain text without encryption is indicative of unsecure data, while unformatted data requiring processing does not specifically relate to encryption or the transformation of readable text into an unreadable format. Thus, only the definition that describes data that has been encrypted accurately characterizes cipher text.