A．It is signed for by the recipient.B．A record of the delivery is kept by the post office.C．The post office undertakes to deliver it to the addressee in person.D．Recorded delivery mail is carried with the ordinary unregistered post.
A．It is signed for by the recipient.
B．A record of the delivery is kept by the post office.
C．The post office undertakes to deliver it to the addressee in person.
D．Recorded delivery mail is carried with the ordinary unregistered post.