A) Though this type of net is fairly uncommon and, as yet, has no descriptive name, it is becoming slightly more popular, perhaps due to its quirkiness.
These nets are designed with a stake instead of an end ring due to the terrain they are intended for. Whereas one would normally set a purse-net and push the bottom ring into the ground to give it purchase and make it close when it is hit by a rabbit, having a peg or stake means this can be inserted into hard or soft ground to give it more purchase. This peg is the point of leverage to make the net purse in a way a ring rarely does. However, as with all nets, their use is down to personal preference.