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Which of the following is a subtype of Blob?

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Which of the following is a subtype of Blob?

(a) Elemental Object

(b) Create Object

(c) Data Object

(d) File Object

I had been asked this question in an international level competition.

The doubt is from Blobs in JavaScript topic in portion Caching, Debugging and Animation of JavaScript

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Correct answer is (d) File Object

The best I can explain: The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user’s system. The client-side JavaScript File object is a subtype of Blob: a File is just a Blob of data with a name and a modification date.

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