Which action best prevents a catheter-related bloodstream infection (CRBSI) for a patient with a central line (central venous catheter)?

1. Change the central line dressing on a fixed weekly schedule no matter what
2. Use sterile technique for dressing changes and assess the insertion site daily
3. Use non-sterile gloves when making line connection or tubing changes
4. Flush the line only on the days that intravenous medications are given

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