When You Write an Accurate Letter of Recommendation for a Friend

When you write an accurate letter of recommendation for a friend, which of the following would be most helpful?

A) Begin and end the letter with negative aspects and positives the middle.
B) List the most positive aspects first and place any negatives farther down the letter
C) List any negatives first and then end with the most positive strengths.
D) The order which positive and negative aspects are mentioned is not important.