NAT questions do not have any options. The answer is a specific signed real number that the candidate must enter using a virtual numeric keypad on the screen. These questions test calculation accuracy and conceptual depth. Usually, a range/tolerance is provided in the backend (e.g., if the answer is 12.5, the system might accept 12.4 to 12.6). There is NO negative marking for NAT questions, making them 'safe' to attempt.