Discussion
In the detection of image-based steganography, the "RS steganalysis" technique is primarily used to identify which of the following ?
Answer: C
RS steganalysis identifies pixel relationship irregularities.
RS (Regular-Singular) steganalysis, introduced by Fridrich, Goljan and Du, detects LSB embedding in images. It divides the image into small groups of pixels, applies flipping functions to their least significant bits, and counts how many groups become more regular or more singular (smoother or noisier). In a natural image these counts follow a predictable relationship; LSB embedding disturbs it, and the size of the disturbance even estimates the length of the hidden message.
It analyses pixel values, so it does not look for hidden audio, and EXIF metadata is a separate forensic check. Since one option is correct, 'None of these' is wrong.
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