To Assess Whether or Not an Arteriovenous Fistula Is Functioning

To assess whether or not an arteriovenous fistula is functioning, what must be done and why?

A) Palpate the quality of the pulse distal to the site to determine whether a thrill is present; auscultate with a stethoscope to appreciate a bruit to assess the quality of the blood flow.
B) Palpate the quality of the pulse proximal to the site to determine whether a thrill is present; auscultate with a stethoscope to appreciate a bruit to assess the quality of the blood flow.
C) Palpate gently over the site of the fistula to determine whether a thrill is present; listen with a stethoscope over this site to appreciate a bruit to assess the quality of the blood flow.
D) Palpate over the site of the fistula to determine whether a thrill is present; check whether the extremity is pink and warm.