help in wordpress privacy settings please

i just started to make a new blog, and i found privacy settings in wordpress

wich one is the best choice?

a)I would like my blog to be visible to everyone, including search engines (like Google, Sphere, Technorati) and archivers

b)I would like to block search engines, but allow normal visitors

Of course, go for a

a)I would like my blog to be visible to everyone, including search engines (like Google, Sphere, Technorati) and archivers

If you chose B, your site will not be indexed by Google and nobody will see your site when searched on google.