Cоnsider the fоllоwing-A pаtient is brought into the emergency room аnd issued 2 units of emergency releаse O Negative units of blood. Inventory in your facility is now limited to the following on hand units of:15 O pos, 4 B pos, 2 B neg, 5 A neg ,15 A pos, 1 AB neg, 3 O neg, 3 AB posAccording to the blood center, it will be three hours before you can obtain more blood. The patient is in surgery and has been found to have a ruptured spleen. He orders four more units of emergency release red cells . Keeping in mind what blood has already been transfused, what units would you issue to the OR nurse?