Show the tree that is the result of removing the following elements (in order): 13, 16, 12.

Describe the three-tier structure of checkpoints (priority-1, priority-2 and priority-3) set forth by the WAI.

What will be an ideal response?

For a small system, site preparation can be as simple as rearranging the furniture in an office to make room for a computer.

Answer the following statement true (T) or false (F)