Why must a customer provide an iOS diagnostic report before selling an AppleCare+ agreement?

The correct response relates to ensuring that the device meets the functional AppleCare+ requirements. When selling an AppleCare+ agreement, it is crucial that the device is operational and meets specific criteria set by Apple. The iOS diagnostic report provides vital information regarding the device's hardware and software status, enabling the advisor to confirm whether the device is free from any known issues that might disqualify it from coverage under AppleCare+. This requirement helps maintain the integrity of the service and ensures that customers only purchase coverage for devices that truly qualify for it.

While warranty status, software updates, and user ownership are important factors in various contexts, they are not the primary reason for requiring the diagnostic report in this situation. The focus here is squarely on confirming that the device is functionally suitable for AppleCare+ coverage.