What are two common TCP applications?

What are two common TCP applications? (Choose two.)

A.
TFTP

B.
SMTP

C.
SNMP

D.
FTP

E.
DNS

Explanation:
Explanation/Reference:
SMTP uses TCP port 25, while FTP uses TCP ports 20 and 21.
http://pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/