'Treatment' is an element of which one of the following models of communication?

Which of the following statements are correct regarding effective communication? i. Listening is an active psychological process. ii. Interpersonal communication involves direct exchange between individuals rather than isolated internal reflection. iii. The message should lack clarity to encourage multiple interpretations. iv. Communication should ignore the needs and background of the target audience. Choose the correct option:

Which of the following audio-visual aids uses indirect (reflected) projection via mirrors?