Final answer:
Effective sales demonstrations combine telling, showing, and involving the prospect, providing comprehensive engagement that highlights product benefits, offers visual understanding, and fosters direct interaction.
Step-by-step explanation:
The most effective sales demonstrations often include a mix of telling, showing, and involvement of the prospect. Telling involves explaining benefits and features of the product or service, while showing provides a visual representation to give the prospect a better understanding of the product's capabilities. Involvement of the prospect elevates the effectiveness by creating an interactive experience where prospects can engage directly with the product, giving them a hands-on feel and allowing them to visualize how it fits into their life or workflow. Therefore, the answer to what are some of the most effective sales demonstrations is 4) All of the above.