Read the introductory paragraph and decide what the sentence in bold does. Choose the correct answer.

Most people do not realize that technology can tell who they are without a passport or even a name. The science of biometrics uses people’s physical characteristics in order to identify them. It uses information like the distance between the nose and the mouth, the pattern in the iris, or fingerprints. This information is very personal. If it gets into the wrong hands, the results can be terrible. Biometrics can violate personal privacy in several serious ways.