What does the term Keyword Prominence refer to?

2. What does the term Keyword Prominence refer to?

• It refers to the fact that the importance of choosing high traffic keywords leads to the best return on investment
• It refers to the importance attached to getting the right keyword density
• It refers to the fact that the keywords placed in important parts of a webpage are given priority by the search engines
• It refers to the fact that the keywords in bold font are given priority by the search engines