Which biometric is described as expensive with a low false acceptance rate?

• A. Fingerprint recognition
• B. Iris recognition
• C. Hand geometry
• D. Voice recognition

Answer: (B)

The main idea here is the trade-off between accuracy and cost in biometric systems. A very low false acceptance rate means the system rarely lets an impostor in, which is a hallmark of iris recognition. The iris has highly unique, stable patterns that are difficult to mimic, so recognition can be extremely accurate. However, achieving that level of reliability requires specialized hardware—high-resolution infrared imaging, precise illumination, and sophisticated processing to capture and analyze the iris reliably. Those requirements drive higher upfront and ongoing costs, making iris recognition one of the more expensive biometric options. Other methods tend to be cheaper but sacrifice some accuracy: fingerprint systems are affordable but can be fooled by poor-quality samples or spoofing; hand geometry is inexpensive but offers lower discrimination; voice recognition is cheap but more sensitive to noise and spoofing.