Final answer:
In memo writing, salutations and complimentary closings are not used. Memos differ from business letters as they do not require a letterhead, modified-block letter style, or indentation of paragraphs. Option A.
Step-by-step explanation:
When writing a memo, you must focus on conveying your message in a format that differs from a typical business letter. Memo writing is more direct and does not use salutations or complimentary closings.
Unlike the block formatting used in a business letter, which is left-justified and single-spaced, a memo does not require the use of letterhead, nor does it adhere to the modified-block letter style, and paragraphs should not be indented. Instead, memos are straightforward and to the point.
To write a business letter, you should follow a structured format that includes a date, addresses, a salutation, a body, and a closing line. The closing of a business letter should be brief, with only the first word of the closing capitalized, followed by a comma, and it should include your signature above your typed name after leaving two blank lines.
So Option A.