Before investing further in the project, a customer and the stakeholder of the project wants...

 Prototyping is an elicitation technique that involves creating a mock-up or a simulation of the final product to demonstrate its functionality and design to the customer and the stakeholder. Prototyping can help the BA to obtain feedback, validate requirements, and resolve ambiguities or conflicts early in the development process. Prototyping can also help the customer and the stakeholder to visualize the final product and confirm that it meets their expectations and needs. References:

IIBA BABOK Guide, Section 10.25, Prototyping

Top 9 Requirements Elicitation Techniques Used by Business Analysts, Software Testing Help

Prototyping Use as a Software Requirements Elicitation Technique: A Case Study, Springer Link