The unlicensed assistive personnel (UAP) reports that a client's blood pressure cannot be measured in the arms because the client has casts on both arms and is unable to be measured in the legs because the client is in the supine position. Which action should the nurse implement?

Demonstrate how to palpate the popliteal pulse with the client supine and the knee flexed.

Estimate the blood pressure by assessing the pulse volume of the client's radial pulses.

Advise the UAP to document the last blood pressure obtained on the client's graphic sheet.

Document why the blood pressure cannot be accurately measured at the present time.