Which of the Following Guidelines Applies to Writing Business Letters

Which of the following guidelines applies to writing business letters in a medical office?

A) The text in the body of the letter should always be double-spaced.
B) Insert an extra line between paragraphs.
C) On the second page, use letterhead and put the name of the addressee, the page number, the date, and the subject in a header.
D) The text in the body of the letter should always be double-spaced AND on the second page, use letterhead and put the name of
The addressee, the page number, the date, and the subject in a header.
E) All of these