What must licensees do in response to a Board inspection or investigation?

The correct choice emphasizes the importance of cooperation and timeliness in responding to a Board inspection or investigation. Licensees are required to cooperate fully with the investigation to ensure a thorough and fair assessment. This means providing the necessary information and access to records as requested by the Board.

The requirement to respond within 21 days allows for due process and gives licensees an adequate timeframe to gather any information needed to comply with the Board's request. Timely responses are critical as they help maintain the integrity of the veterinary profession and ensure that standards of care and practice are met.

The other options, which suggest shorter response times or non-responsiveness, do not align with the expectations set forth for licensees. Not responding or ignoring requests would likely result in further complications or disciplinary action, as it undermines the Board's efforts to conduct necessary investigations effectively. Overall, the expectation for cooperation and a reasonable response time reflects the importance of accountability within the veterinary field.