Which part of a formal e-mail is optional a the closing b the contact info c the persons last name d the salutation

B) The contact info.

The purpose of an email letter is to convey a message, inform and/or report, and within its structure there are some part necessaries such as the heading, the salutation, the body, the closing and the complete name of the person or company who is sending it, however the author always have the choice to keep private his/her personal and contact information, such as phone number, address, etc. so it can be contacted by email only.

it is about the use of non animal tested cosmetics.

the conclusion would be the most affected category scoring