Answer:
E. Public Relations
Explanation:
Public relations has relatively low cost, generally high credibility, and has a relatively difficult understanding of its effectiveness. Public relations (PR) is one of the important part of any organization's promotion mix's element which helps organization in building its image in the general public. It can be defined as the the process of managing all kinds of communications between a firm and its publics. It is also said that if you need to build a brand then you should take help from PR, brands are built up by PR not advertisement. It helps organization in shaping its image as well. PR includes seeking awards, speaking at public conferences and sending press releases and articles to the newspapers etc.