Which of the following tools is used to attack the Digital Watermarking?

2Mosaic is a watermark-attacking tool that works by dividing an image into small mosaic-like segments, effectively destroying or rendering undetectable any embedded digital watermark. It is categorized specifically as a watermarking attack tool in security and steganography contexts.

Gifshuffle is a steganography tool used to hide messages within GIF images by shuffling color maps, not a tool designed to attack or remove digital watermarks.

Active Attacks is a broad category of attack methodology (e.g., man-in-the-middle, replay attacks) and is not a specific tool used to attack digital watermarking.

Steg-Only Attack is a steganalysis attack model in which the attacker has access only to the stego object, and is not a specific tool used to attack digital watermarks.