How are site maps important for the search engine optimization process?

Question: How are site maps important for the search engine optimization process?

1.Site maps help the search engine editorial staff to quickly go through a website, hence ensuring quicker placement

2. Google gives credit to the websites having site maps. The GoogleBot looks for the keyword or title “Site Map” on the home page of a website.

3.Site maps help the search engine spider pick up more pages from the website

4.None of These

Answer:3