It says, to make adsense to crawl your pages and show targetted ads, add these lines on top of robots.txt.
User-agent: Mediapartners-Google Disallow:
User-agent: Mediapartners-Google* Allow: / User-agent: Googlebot-Image Allow: /wp-content/uploads/ User-agent: Adsbot-Google Allow: / User-agent: Googlebot-Mobile Allow: /
Which is the right one? Do I need to make any changes or just leave like that?