To include this signature in a formal letter, it should be revised to contain the writer’s

full first name and middle name.
nickname and last name.
title and full first name.
full first name and last name.

Full first name and last name.

Explanation:

So the person you are sending the letter to can know exactly who is sending the letter.

showing or having an insensitive and cruel disregard for others. (so basically being heartless)

hope this : )