A letter written to the head of an institution is an example of:AInformal writingBNoticeCArticleDFormal writingAnswer: D. Formal writing Read Explanation: A letter written to the head of an institution (like a principal or director) follows a formal format. It includes:Proper salutation (e.g., Respected Sir/Madam)Formal languageClear subject and purposeProper closing (e.g., Yours faithfully) Read more in App