19. Which of the following is the most effective method for reducing security risks associated with building entrances?

Вариант ответа 1 - A. Minimize the number of entrances

Вариант ответа 2 - B. Use solid metal doors and frames

Вариант ответа 3 - C. Brightly illuminate the entrances

Вариант ответа 4 - D. Install tamperproof hinges and glass