What is a legitimate privacy drawback of device fingerprinting?

• A. It can be used to compile long-term browsing histories and track your behavior across multiple websites, so you lose control of information about you.
• B. It allows advertisers to know your exact identity with certainty.
• C. It confines tracking to a single website only.
• D. It prevents any long-term tracking altogether.

Answer: (A)

Device fingerprinting builds a unique profile of your device from a mix of browser, OS, and hardware characteristics, such as fonts, plugins, time zone, screen resolution, and other settings. A real privacy drawback is that this fingerprint can be used to track you across many websites over time, even if you clear cookies, so you lose control over information about you. Since fingerprints can be stable and cross-site, advertisers and data brokers can link your sessions and build a long-term view of your interests and behavior.

The idea that you’ll know your exact identity with certainty isn’t how fingerprinting typically works; it identifies a device, not necessarily a real-world person unless additional data is attached. It also isn’t limited to a single site—fingerprints are useful for cross-site tracking. And it certainly doesn’t prevent long-term tracking; it enables it, which is the core privacy concern here.