Final answer:
Tolerances are design specifications that reflect customer requirements and are known as acceptable limits of variation in a product's dimension or properties, playing a vital role in the evaluation of a design's quality.
Step-by-step explanation:
Design specifications that reflect customer requirements for a product are known as d) tolerances. Tolerances specify the acceptable limits of variation in a physical dimension or physical property of a material or component. These specifications form a critical part of the criteria and constraints of a design process.
A constraint is a limitation or condition that design must meet, and it is a binary condition; it is either met or not. On the other hand, a criterion is a measurable standard or attribute of a design, like weight or size, that can vary and be used to compare different designs to determine which one best solves the design problem. Tolerances are used to evaluate the quality of a design since they are critical to ensuring that the product meets the required dimensions and function as intended.