The nurse is assessing an ulcer on a client's lower extremity, which is likely the result of either venous or arterial insufficiency. Which assessment technique should the nurse use to differentiate the pathophysiology causing the ulcer?

Compare the skin turgor of the client's upper and lower leg.

Observe the specific location and appearance of the ulceration.

Note any change in the color of the ulcer when the leg is moved.

Measure the degree of joint range of motion in the extremity.