Final Answer:
CC: David Wilson, this notation at the bottom of a letter indicates that a copy is being sent to David Wilson as a "Carbon Copy" for his information. The correct option would be A. CC: David Wilson.
Step-by-step explanation:
In business correspondence, "CC" stands for "Carbon Copy." When you key "CC: David Wilson" at the bottom of a letter, it indicates that a copy of the letter is being sent to David Wilson for his information.
This notation is a common way to inform recipients, in this case, David Wilson, that they are not the primary addressee but are receiving a copy of the communication.
Options B and C are not typically used for indicating copies in a business letter. "Enclosure" is used to indicate additional documents included with the letter, and "BCC" (Blind Carbon Copy) is used in email to send a copy without the knowledge of the primary recipient. Option D, "FYI," is not a standard notation for indicating copies in a letter.