By what method must the committee give the respondent written notice of its determination?

The correct answer is certified mail. This method is significant because it ensures that the respondent receives a formal and verifiable communication regarding the committee's determination. Using certified mail provides a record of both the mailing and the receipt, which is crucial in maintaining transparency and accountability in the process. It offers legal proof that the notice was sent and delivered, protecting both the committee and the respondent's rights.

Certified mail is commonly utilized in formal communication settings such as this to ensure that critical information is conveyed appropriately, and it adheres to the protocols and regulations established within the legal context. This method contrasts with other options, such as regular mail, which does not offer the same level of assurance regarding delivery and receipt, or informal channels such as email, which may lack the required formality and could lead to issues regarding confirmation of receipt.