Place the actions in order for an adult with diabetic ketoacidosis and an initial potassium level of 3.0 mmol/L.

Confirm DKA severity, hypovolemia, and electrolyte risk first. Begin crystalloid resuscitation, then replace potassium because the initial level is below 3.5 mmol/L. Delay insulin until potassium is above 3.5 mmol/L to reduce the risk of life-threatening arrhythmia and respiratory muscle weakness. Once safe, start insulin and continue frequent glucose, potassium, ketone, acid-base, and fluid-balance monitoring.