Prioritize the Procedure Employed to Directly Measure the Left Heart

Prioritize the procedure employed to directly measure the left heart pressures, using a catheter. (Enter the number of each step in the proper sequence; do not use commas or spaces.)
A) The catheter is advanced against the flow of blood into the aorta.
B) The catheter is inserted into a femoral artery.
C) The catheter is advanced into the left ventricle.
D) The catheter is then used to measure the aortic pressure, systolic, and diastolic pressures.