Answer :

Final answer:

To add 'www.' and '.com' to a site and open it in the current tab, the correct format is 'a) www.site.com'. For opening a link in a new tab, use the HTML markup ''.

Explanation:

To add www. and .com to a site name, and open it in the current tab, the correct format is a) www.site.com. The domain name ending such as .com typically indicates a commercial site and is used in the Uniform Resource Locator (URL) to direct a web browser to the desired website. When wanting to open a link in a new tab or browser window, the HTML markup code is used. This code will instruct web browsers to open the hyperlink in a new browser tab or window.