Question: What is a prerequisite for a Mobile Equipment (ME) to display its electronic marking (e-marking) in response to the *#07# procedure, apart from supporting e-marking itself?
Option 1: The ME must have an active cellular connection.
Option 2: The ME must support Physical user input features.
Option 3: The ME's battery must be at least 50% charged.
Option 4: A SIM/USIM card must be inserted and authenticated.
Explanation: According to the specifications, for an ME to display its e-marking in response to the *#07# procedure, it is required that the ME supports Physical user input features, in addition to supporting e-marking. This ensures the user can interact with the device to initiate the display of the e-marking. The presence of a SIM/USIM or an active cellular connection is not mandated for this specific function, and battery charge level is unrelated to the capability to display regulatory information.