In the URL http://www.cs.jcu.edu.au, the term "http" refers to:

In the URL http://www.cs.jcu.edu.au, the term "au" refers to:

Hyperlinks can appear in a web page as:

Which of the following URLs are valid?

The HTML markup tag

defines:

The HTML markup tag

The HTML markup tag

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defines:

The HTML markup tag

defines:

The HTML markup tag
defines:

The HTML markup tag

defines