You Are Applying for the Position of an H

You are applying for the position of an H.R. Consultant but are unsure which companies in your city have an opening. You decide to mail your résumé to a few companies. Which of these guidelines would you keep in mind while mailing your application letter?

A) You thoroughly research the requirements of your position.
B) You mail the letter only to those companies where you are acquainted with the managers.
C) You refrain from mailing unsolicited application letters.
D) You email only the application letters.