What Statement About a Cover Letter Is True

What statement about a cover letter is true?

A) It should signify an interest in the employer and let the employer know that you took time to research the organization.
B) It must be handwritten so the employer can determine whether charting will be legible.
C) It should be limited to one paragraph because time is of the essence.
D) It should let the employer know your desired salary,shift,and area of practice.