In Domino 8.5, when the router is running in a steady state and a new message is deposited in MAIL.BOX, a copy of the message is made and placed on a mailbox event queue which is then used by a new MailEvent thread in the router. Which of the following is this feature?

A.
Mailbox copy services

B.
Router threaded delivery

C.
Mailbox event notification

D.
Mail queue delivery scheduler