I need to configure search engine optimization of a sharepoint site

From the below options what do you guys think should be the correct answers

The requirements are

Internet search engines must properly rank pages so that the more popular pages on the site appear first in the Internet search engine results. SharePoint must generate the sitemap.xml and robots.txt files that are used by Internet search engines.

And the options are

B. Activate the Search Engine Sitemap feature in the site collection.

C. Disable anonymous access to the site collection while you make changes.

D. On the Search Engine Optimization Settings page, in the Include these meta tags in pages text box, enter

E. Ensure that the Search Engine Sitemap job is running.

F. On the Search Engine Sitemap Settings page, enter Disallow: /_ConfigurationFiles/ to the

Any inputs.

Thanks