In the panel working for cancellation of route the number in the counter changes and white indication appears after A. 120 seconds B. 90 seconds C. 50 seconds D. None of these

The correct answer is: A. 120 seconds

The number in the counter changes and white indication appears after 120 seconds. This is because the system needs to give the user enough time to cancel the route before it is automatically canceled.

Option B is incorrect because 90 seconds is not enough time for the user to cancel the route. Option C is incorrect because 50 seconds is not enough time for the user to cancel the route. Option D is incorrect because none of the other options are correct.