Which of the Following Statements Was True of Special Delivery

Which of the following statements was true of Special Delivery?

A) When something was marked Special Delivery, it was delivered as soon as it reached the recipient's post office.
B) It could not be used for items sent to a post office box or to a military address.
C) Special Delivery mail got a unique tracking number, and the sender was notified when the mail was received.
D) It alerted postal workers that a package or letter contained unusual contents.
E) Both when something was marked Special Delivery, it was delivered as soon as it reached the recipient's post office AND it alerted postal workers that a package or letter contained unusual contents.