Final answer:
The inquiry about what unique product the customer expects from a project is an instance of a project constraint, which is a necessary condition the project must satisfy. Constraints, like cost or product specifications, establish project limitations. A derived demand example besides labor could be the demand for steel following a need for construction.
Step-by-step explanation:
The question "What unique product does the customer expect from the project?" is an example of a project constraint. A constraint is a limitation or condition that must be met within a project. Constraints are absolutes that define the boundaries of a project's deliverables or processes. For example, in a project designing a water filtering system, a constraint might be the budget available for the system or physical factors such as the system's size and weight.
A derived demand is demand for a product or service that results from the demand for another product or service. For instance, demand for steel is often a derived demand, as it is needed for the construction of buildings and infrastructure, whose building is prompted by demand for real estate and transportation.