Final answer:
The nurse would use the umbilicus, midclavicular lines, lower border of the right ribs, and iliac crests as landmarks to map the client's abdomen into four quadrants.
Step-by-step explanation:
The nurse would use the umbilicus as a landmark to map the client's abdomen into four quadrants. The quadrants are created by drawing one horizontal and one vertical line that intersect at the umbilicus.
In addition to the umbilicus, the nurse could also use the midclavicular lines as landmarks. These lines are drawn vertically down the center of each clavicle and can help identify the boundaries of the quadrants.
Other landmarks that could be used include the lower border of the right ribs and the iliac crests. These landmarks can help determine the upper and lower boundaries of the quadrants.