In case of opencast working where any part of a public road or railway lies within the danger zone then there are some conditions imposed on charging or firing under current CMR 2017. Which of the following do not come under these conditions?

A. two persons are posted one each in either extreme points of such road, railway

B. they should have efficient telephonic communication system

C. they must have loud speakers or other means of intimating traffic

D. the charging or firing is not possible unless permission is obtained from PWD or Railway authority prior to such activity

Answer: Option D