Which of the Following Is the Best Advice for a Cover

Which of the following is the best advice for a cover message that accompanies a résumé sent via e-mail?

A) Take the time to prepare a professional cover message to accompany your résumé sent electronically.
B) Mail the cover message separately from the résumé sent via e-mail.
C) Shorten your e-mail cover message to a brief statement such as Please consider the attached résumé for your opening.
D) Skip the cover message as it is unnecessary to introduce yourself because the e-mail includes your name.