What type of document serves as a formal request for information within official correspondence?

A business letter is the correct type of document that serves as a formal request for information within official correspondence. Business letters are structured, professional communications that adhere to conventional formats. They are widely recognized as formal documentation in both governmental and business contexts, making them suitable for requests that require a clear, respectful, and official tone.

In contrast, informal emails are typically less structured and may lack the necessary formality required for official requests. Technical reports, while informative, serve a different purpose, usually focusing on presenting research findings or technical data rather than acting as a request for information. Lastly, a meeting agenda outlines the topics to be discussed in a meeting rather than requesting information, making it unsuitable for the context of a request. Therefore, the business letter is the appropriate choice for formal communications that involve seeking information.