A manufacturer wants to provide registration for an Internet of Things (IoT) device with limited...

The OAuth 2.0 Device Flow is intended for devices that have limited input or display capabilities and therefore cannot easily support a standard browser-based login interaction. Instead of collecting full credentials on the device, the user completes authorization on a secondary device using a verification code and URL. That is why Salesforce recommends device flow for TVs, appliances, kiosks, and similarly constrained hardware. Asset Token Flow solves a different problem: it authorizes a registered asset or device to call Salesforce as a connected thing. Here the requirement is about registration and user authorization from a constrained device, so the device flow is the correct match. The design distinction is between human sign-in on limited hardware and secure machine identity for an asset. This is why option D is the best answer in Salesforce terms.