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.

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