The most common criticism of surveillance tools is that they the technology is invasive.
Hence, Option C is correct.
One of the most popular surveillance techniques is the use of video cameras. Surveillance can be classified as direct, pre constructive, or reconstructive. The term "covert surveillance" refers to monitoring or watching someone using procedures that are concealed or disguised so the target is unaware of it. The term "overt surveillance" refers to the deployment of instruments that are obvious and recognizable, such a well marked CCTV system.
A digital video surveillance system is one that can record images and movies that can later be stored, sent across communication networks, or both. Systems for digital video surveillance can be employed in almost any setting.
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