The Bharatiya Sakshya Adhiniyam defines a "document" broadly around the idea of recording or conveying information, so each option can be tested against whether it genuinely serves that recording function.
Three of the four items exist specifically to record or convey information, while the fourth exists primarily as an artistic or satirical expression rather than an informational record.
The correct answer, being the one that is not a document under the Bharatiya Sakshya Adhiniyam, is therefore Caricature.