Some words, when followed by a colon, have special meanings to Yahoo. What is performed by the link: operator?

Q) Some words, when followed by a colon, have special meanings to Yahoo. What is performed by the link: operator?

Answers:
• It shows all the outbound links from the URL
• It shows how many pages of the site Yahoo is pointing to
• It shows all the pages that point to that URL
• It shows URLs with broken links