After administering the client’s 0730 prescribed dose of regular insulin per a sliding scale, which action by the practical nurse (PN) has the highest priority?

Instruct the unlicensed assistive personnel (UAP) to take the client a breakfast tray

Observe the client for pallor, diaphoresis, or fatigue

Measure the client’s vital signs and oxygen saturation

Notify the charge nurse of the dose of insulin administered