What must occur before a workstation can exchange HTTP packets with a web server?

What must occur before a workstation can exchange HTTP packets with a web server?
A . A UDP connection must be established between the workstation and its default gateway.
B . A UDP connection must be established between the workstation and the web server.
C . A TCP connection must be established between the workstation and its default gateway.
D . A TCP connection must be established between the workstation and the web server.
E . An ICMP connection must be established between the workstation and its default gateway.
F . An ICMP connection must be established between the workstation and the web server.

Answer: D

Explanation:

HTTP uses TCP port 80. http://pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/