To create a key, add the key element at the top level of the style sheet as a child of the _____ element.

The ________ button allows you to insert fields such as the date, a filename or a page number into a header or footer

Fill in the blank(s) with correct word

A(n) ____________________ is a physical connection created when network devices are connected to one another by two or more physical media links.

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