Question

what is a criterion for all products made using the process of technological design?
the product must be cheaper than similar products.
the product must be available to any user who wants it.
the product must solve the problem for which it was designed.
the product must be capable of solving a variety of problems.

Explanation:

The goal of technological design is to create a product that addresses a specific problem. While cost - effectiveness (cheaper than similar products) and availability (available to any user) can be desirable, they are not universal criteria. A product designed for a specific problem may not need to solve a variety of problems. The core criterion is that it solves the problem it was intended for.

Answer:

The product must solve the problem for which it was designed.