An older adult client's blood pressure (BP) is 120/80 mm Hg when in a lying position. When the nurse retakes the client's BP in a sitting position, the BP is 92/60 mm Hg. Which intervention is appropriate for the nurse to implement?
a) Administer a bolus of intravenous fluids
b) Elevate the client's legs
c) Encourage the client to stand up slowly
d) Administer a dose of antihypertensive medication