• (A) In rocky areas and dense, jungles, the trace cut may be avoided and some suitable arrangement may be made so as to gain access for ascertaining details
• (B) Reconnaissance is best done by topographical surveys
• (C) The detailed survey should be conducted for a strip covering on either side of the chosen centre line a width of about 15 m in case of straight stretches and 30 m in case of sharp curves
• (D) all of the above