Identify a guideline to type the body of a business letter.
1) The first paragraph of the body should be a minimum of eight lines in length.
2) The body should be typed single-spaced, with one double-spaced blank line between paragraphs.
3) The body should be typed in all-capital letters to grab the reader's attention easily.
4) The last paragraph of the body should be a minimum of six lines in length.