Before Connecting the Sample Syringe to an Adult's Arterial Line

Before connecting the sample syringe to an adult's arterial line stopcock, what would you do?

A) Flush the line and stopcock with the heparinized intravenous solution.
B) Aspirate at least 5 ml of fluid or blood using a waste syringe.
C) Align the stopcock off to the patient and on to the flush solution.
D) Increase the flush-solution bag pressure by 20 to 30 mm Hg.