A nurse plans to assess a client for orthostatic hypotension after the client reports dizziness when standing. Which action should the nurse take first?

Assist the client to a standing position and immediately measure blood pressure.

Encourage the client to ambulate in the hallway to reproduce symptoms.

Measure the client's blood pressure and heart rate while the client is lying supine.

Ask the client to sit at the side of the bed and report any dizziness.