What is the role of Public Relations, marketing homework help

Provide an example about how public relations (PR) principles apply with Starbuck

Write a 700 word paper in which you examine the following:

The multiple definitions of Public Relations.
The connection between PR and the promotional aspect of the marketing mix (advertising, publicity, public relations)?
- How are they similar and how are they different?
- How might PR be more important during a crisis situation for an organization?

Include two outside references as well as citations with your paper.