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Solution

Explanation: A formal letter, which is typically used in professional or official communication, should adhere to a set of specific guidelines: 1. Formal: The language used should be respectful and professional, following a proper structure. Informal language or slang should be avoided. 2. Polite: The tone should be courteous and respectful, even if the message conveys something negative or critical. 3. Concise: The content should be clear and to the point, avoiding unnecessary details or excessive elaboration. The purpose of a formal letter is to communicate information efficiently. Thus, the best approach for formal letters is to be polite, formal, and concise.