Multilingual sitemap best practices seo

a a little lost here and I want to know which one is the best way to do it

I have a website using wordpress with all in one seo and xpml in 3 languages with their sitemaps (default in spanish) (english version)

1.- First what is the best practice to put in the robot.txt,

to put just one line ( )

or the 3 sitemap url? (also the xpml plugin automatic add a  rel="alternate" hreflang="x
in each page with the link to the translated page)

2.- for google webmaster tools what are the best practices?

submit the 3 sitemaps submit just 1 sitemap and hope google understand the translation with the use of  rel="alternate" hreflang="x"

or Create 3 different accounts, 1 for each language?
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(1) would work out without any need for (2)

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WebserviceMXAuthor Commented:
It doesnt help me very much
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