The correct answer is "D" - use all three methods. The Canadian staff tried every way they could think of to make sure every unit was capable of making good battlefield decisions without relying on the commanders behind the lines. They used a massive composite of air photos of the ridge to identify all key German defences - barbed wire, trenches, underground shelter entrances, machine guns, mortars and artillery. From this they printed maps for every battalion, company and platoon that identified every danger near their objectives.

Each unit walked over a practice battlefield behind the lines many times - with stakes to identify German defences, and ropes to mark the lines of advance. They learned which units would be on their flanks, and what their objectives were as well. Staff gave lectures to each company using maps, notes and a scale model battlefield.

It was the first time commanders had shared so much information with the front line soldiers - and it worked!