How do the canopy and full walls of Event Tents connect together?

The answer depends on how many full walls you have: No full wall = No velcro on all sides. 1 full wall = Velcro on side C. 2 full walls = Velcro on sides B and D. 3 full walls = Velcro on sides B, C, and D. 4 full walls = Velcro on all sides.