Which of the following is NOT a technique used in public relations?

In the context of public relations, various techniques are employed to build and maintain a positive image and communicate effectively with the public. One of these primary functions is to manage a brand's reputation through strategic communication, which includes methods such as news conferences, celebrity endorsements, and partnerships with charities. These activities are designed to enhance visibility, credibility, and a favorable public perception.

Direct sales, however, are primarily associated with the marketing and sales domains rather than public relations. This technique focuses on selling products or services directly to consumers through personal interactions, bypassing traditional retail or advertising channels. While it may be a critical component of a company's overall strategy, it does not involve the principles of relationship building or managing public perceptions that are central to public relations efforts. Hence, it stands out as a technique that does not belong to the realm of public relations.