A client has a prescription for vital sign measurement every four hours. The nurse observes that the client's blood pressure has increased from 140/60 mm Hg at noon to 180/90 mm Hg four hours later. Which action should the nurse implement?

Obtain an automatic blood pressure machine for hourly readings.

Plan to measure the blood pressure in four hours as prescribed.

Repeat the client's blood pressure measurement in fifteen minutes.

Reassess the blood pressure if the client reports other symptoms.