The final permission bit is the _________ bit.

____ connect a network to a common resource such as the Internet.

A. Switches B. Proxies C. Routers D. Firewalls

At a certain width-known as a(n) __________-a layout no longer looks good, or you may decide that you'd like to move elements or add or remove content to accommodate that window size. 

Fill in the blank(s) with the appropriate word(s).