which part of a formal e - mail is optional?\n○ the closing\n○ the contact information\n○ the persons last…

which part of a formal e - mail is optional?\n○ the closing\n○ the contact information\n○ the persons last name\n○ the salutation
Answer
Brief Explanations:
In a formal e - mail, the closing, salutation are standard parts. The person's last name is often used in salutation or signature. Contact information is optional as the e - mail itself is a form of contact, and not always necessary to repeat.
Answer:
B. the contact information