The Department shall mail a written report to the facility within _______ from the date of the licensure survey or complaint investigation exit conference.

The correct answer, 10 working days, is in line with the regulations governing the timeline for the Department to communicate findings to a nursing facility following a licensure survey or complaint investigation. This timeframe is established to ensure that facilities receive timely feedback regarding compliance with regulations and standards, allowing them to address any identified issues promptly.

Receiving the report within 10 working days is crucial for facilities as it enables them to understand the Department's findings and take necessary corrective actions to enhance their operations and resident care. This prompt communication fosters accountability and supports continuous improvement in nursing home practices.

Other timeframes, such as 5, 15, or 20 working days, would not align with the established protocol, either being too brief to allow for comprehensive reporting or too lengthy to support timely responsiveness. Thus, the 10 working days strikes an appropriate balance in ensuring efficient communication while affording the Department adequate time to prepare a thorough report.