What Is the Least Accurate Statement About Routine Response Messages

What is the least accurate statement about routine response messages?

A) A response message written on company stationery or sent using a company e-mail address is a legally binding contract.
B) In addition to supplying answers, a response message should promote your organization and products.
C) Routine response messages generally use the indirect organizational pattern.
D) Use the subject line of a reply letter to refer to an earlier correspondence so that you can omit this reference in the opening of your letter.