What is necessary for a prototype to be effective?

A) It must be a working model of the product or service.
B) It must communicate what our ideas look like,how they behave,and how they work.
C) It must be the same as the model that will be launched at the start of the business.
D) It must include engineering models or,for a service,an operational plan.

A prototype is effective when it is able to effectively communicate the ideas and functionality of the product or service. It does not necessarily need to be the same as the final model, but it should accurately represent the key features and behaviors. Including engineering models or operational plans may also be helpful, but the primary goal is to communicate the vision of the product or service.