16. Use the text from a letter below to answer the question that follows.
Dear Mr. Wu:
Thank you for your letter dated 23 November addressed to our marketing director, Ms. Fernandez.
Ms. Fernandez is currently attending a conference and will be out of the office until 5 December. I shall be in contact with Ms. Fernandez and will inform her about your letter, which I know she has been looking forward to receiving.
Please contact me if I can be of any help.
Yours sincerely,
Mr. J. Hobbs
Assistant to Ms. A. Fernandez
What category of business letter is shown above?