No working or gallery shall be extended to a distance of more than . . . . . . . . meters from the nearest ventilation connection unless the current of air is covered upto a point within . . . . . . . . meters of the face by means of fire resistant pipes, tubes, brattices or other material.

A. 3, 3

B. 3.5, 3.5

C. 4, 4

D. 2.8, 2.8

Answer: Option A