A nurse who usually works on a step-down unit is moved to work a 12-hour shift on the critical care unit. Which client is best for the charge nurse to assign to this nurse?

A client who has a new onset diabetic ketoacidosis (DKA) and is on an insulin drip.

A ventilator dependent client with chronic obstructive pulmonary disease (COPD).

A client admitted for a narcotic overdose who is ventilated and has respiratory alkalosis.

A ventilated client admitted today with respiratory failure and respiratory acidosis.