An older client with a continuous peripheral infusion in the antecubital fossae site is reporting that the infusion pump keeps beeping. The practical nurse (PN) determines the pump is displaying a digital alarm reading, "occlusion." Which client assessment should the PN perform first?

A. Check for swelling underneath the elbow: Swelling suggests infiltration or extravasation, which is a common cause of occlusion alarms and must be assessed immediately. B. Measure fluid intake and output: Not directly related to resolving the occlusion alarm. C. Compare the radial pulse volume bilaterally: Not relevant to the occlusion alarm. D. Assess range of motion of the joint: May identify kinking from joint movement but swelling should be checked first.