Which method is primarily used to verify a test-taker's identity during a Kryterion exam?

Biometric verification is primarily used to verify a test-taker's identity during a Kryterion exam because it offers a highly secure and reliable method of identification. This approach utilizes unique biological traits, such as fingerprints or facial recognition, to ensure that the individual taking the exam is indeed the authorized candidate. The use of biometrics minimizes the risk of impersonation and fraud, creating a more secure testing environment.

Other methods, such as personal identification cards, may not provide sufficient guarantees of identity verification on their own, as they can be forged or improperly used. Random video calls could potentially enhance verification, but they are not the primary method used for identity confirmation in this context. Written statements also lack the robustness and security features that biometric verification provides, making them less effective in ensuring that the right person is sitting for the exam. Overall, biometric verification stands out due to its accuracy, security, and efficiency in confirming a test-taker's identity.