Which two protocols are connection-oriented?（）

A.Web browsing
B.downloading a program
C.streaming television shows
D.on-line shopping

A.UDP provides delivery notification and error checking mechanisms.
B.UDP is faster than the Transmission Control Protocol (TCP).
C.UDP application examples include DNS and VoIP.
D.UDP is an application layer protocol.
E.UDP uses a best effort delivery approach.

A.TCP is a transport layer protocol.
B.TCP is faster than the User Datagram Protocol (UDP).
C.TCP provides delivery notification and error checking mechanisms.
D.TCP uses a best effort delivery approach.
E.TCP application examples include HTTP and SMTP.