Which of the following factors contributes to product longevity?

The factor that contributes to product longevity is the quality of materials and design robustness. When products are designed with high-quality materials, they are more durable and able to withstand wear and tear over time. Robust design incorporates features that enhance the product's structural integrity and usability. This means that such products are less likely to fail or degrade quickly, ensuring they last longer in the hands of consumers.

In addition, products designed with longevity in mind often include thoughtful considerations about how they are used and maintained. For example, a well-designed product may be easier to repair, which also contributes to its overall lifespan. By prioritizing quality and robustness in the design phase, manufacturers can create products that remain functional and reliable for an extended period, leading to higher customer satisfaction and potentially lower replacement costs over time.

In contrast, factors such as production volume, frequent updates, and low maintenance requirements do not inherently ensure that a product will last longer; they may address aspects of the product's lifecycle but do not directly enhance its durability or longevity.