Explanation:

Answer: D
The Mata Data refers to the type of data that describes the other data or information.
A general file or document is nothing more than a sequence of bytes that contains information like file name, file size, and date & time when the document was created or modified.
To understand it in more details, consider the following example:
For a common music file, the metadata may include the singer's name, the year it was released, and the lyrics, etc.