Which materials are prohibited during a Kryterion exam?

During a Kryterion exam, certain materials are prohibited to ensure the integrity and security of the testing environment. The correct answer highlights that books, notes, and unauthorized electronic devices are not allowed. This is crucial because these items could provide an unfair advantage to some test-takers, violating the principles of fairness and honesty that govern standardized testing. Unauthorized electronic devices, in particular, can access information or resources outside of the exam's allowed materials, which undermines the assessment's effectiveness in evaluating knowledge or skills.

Prohibiting such materials helps maintain a controlled environment where all candidates have the same conditions and constraints, leading to a more accurate measurement of their abilities. In contrast, while the other options refer to items that might also be restricted, the presence of study materials and electronic devices poses a direct threat to the objective of the exam.