Question: In a Diameter-based protocol supporting SMS-capable Mobile Management Entities (MMEs), what does the `SM-Enumerated-Delivery-Failure-Cause` AVP with a value of `2` indicate?
Option 1: The recipient's equipment lacks support for a specific wireless communication protocol.
Option 2: The mobile device is not equipped to handle Short Messages (SMS).
Option 3: There was an error in the equipment's protocol configuration for data transfer.
Option 4: The service centre experienced congestion, leading to delivery failure.
Explanation: According to defined values, a value of `2` corresponds to EQUIPMENT_NOT_SM-EQUIPPED, indicating SMS delivery failure due to the mobile device not being equipped to handle Short Messages (SMS), highlighting device compatibility's role in service delivery.