What is a tactic where a previous customer provides a testimonial about a product?

The correct answer highlights the importance of leveraging customer testimonials as a powerful marketing tactic. A third-party demonstration refers to the practice in which a former customer or client shares their positive experience with a product, thereby acting as an impartial witness to its effectiveness. This form of social proof can significantly influence potential buyers who often look for validation from others before making a purchase decision.

Testimonials build trust and credibility, showing that real people have benefitted from the product or service. By using authentic voices to recommend a product, businesses can effectively persuade prospects to consider their offerings favorably. This tactic is instrumental in various marketing strategies, including online reviews, video testimonials, and case studies, as they contribute to building a relatable and trustworthy brand image.

The other options reflect different sales techniques that do not align with the concept of testimonials. Substitution involves offering an alternative product. Superior point likely refers to emphasizing a product's strengths over competitors, while the boomerang technique generally relates to handling objections in sales conversations, ensuring they lead to a positive response rather than sharing customer experiences.