60
75
85
90
Answer is Right!
Answer is Wrong!
The correct answer is A. 60 seconds.
While cancelling ART/MRV, siren shall be sounded for 60 seconds. This is to ensure that all personnel are aware that the ART/MRV is being cancelled and that they can take appropriate action.
Option B is incorrect because it is too long. Option C is incorrect because it is too short. Option D is incorrect because it is not a valid option.