Four clients are scheduled to receive IV infusions, but there are only three intravenous (IV) pumps available. Which prescribed infusion can most safely be administered without an IV infusion pump?

A. Ceftriaxone in 5% Dextrose in Water prescribed for pneumonia.
B. Heparin in Normal Saline prescribed for deep vein thrombosis.
C. Magnesium in Normal Saline prescribed for hypomagnesemia.
D. Regular insulin in Normal Saline prescribed for ketoacidosis.