Which of the following best describes a major alteration in an elevating device?

A major alteration in an elevating device refers to any significant changes that impact the device's structural integrity or safety features. This includes modifications that can affect the load-bearing capabilities, the overall design, or the safety mechanisms of the device, such as changing the way it operates or adding new components that influence its performance or safety.

Structural changes affecting safety are critical because they can directly impact how the elevating device operates and can have serious implications for the safety of users. It is essential for such alterations to be carefully evaluated and approved to ensure compliance with safety standards and regulations.

In contrast, factors like the increased number of inspections do not constitute an alteration to the device itself, but rather a procedural adjustment regarding how frequently the device is evaluated. Changes to signage are typically administrative modifications and do not affect the operation or structure of the device. Similarly, cosmetic upgrades are enhancements that may improve the appearance of the device but do not influence its structural integrity or safety. Thus, these options do not reflect the substantial nature of a major alteration.