'Various tools of communication are used by the marketers to promote their products. (i) Why do companies use all tools at the same time? (ii) Name and explain the most commonly used non-personal tool of promotion which is paid for by the marketer. (iii) Which tool of promotion will primarily be used for the following? (a) To promote or protect a company's image or its individual products. (b) An existing product meant for mass usage by literate people. (c) To introduce a new product to a particular class of people through door-to- door visits. (d) To attract attention of the people by using incentives.