which part of a formal e - mail is optional?\no the closing\no the contact information\no the persons last…

which part of a formal e - mail is optional?\no the closing\no the contact information\no the persons last name\no the salutation
Answer
Brief Explanations:
In a formal - email, the closing, the person's last name in the salutation, and the salutation are standard elements. Contact information is optional as the recipient can reply to the sender's email address already visible.
Answer:
the contact information