A 68-year-old male with a history of hypertension, hyperlipi…

A 68-year-old male with a history of hypertension, hyperlipidemia, and smoking presents to the vascular lab for a carotid and upper extremity arterial duplex ultrasound. He reports a history of transient dizziness and weak pulses in his right arm.During the ultrasound evaluation, the sonographer notes the following spectral Doppler findings:Right Common Carotid Artery (CCA): A low-velocity, delayed systolic upstroke with a rounded peak (tardus-parvus waveform).Right Subclavian Artery: A low-velocity, monophasic, delayed upstroke (tardus-parvus waveform) distally.Left CCA and Left Subclavian Artery: Normal high-velocity upstrokes with sharp systolic peaks.where is the most likely site of arterial obstruction?