Multilingual Landing Pages

I am working on having a landing page for multiple languages and wanted to see how I should approach this strategy for SEO purposes.

I understand that a ccTLD (or local IP) would be necessary to be found in the local searches. This not important to me because a qualified lead would normally not perform a local search (pages from country), but a web search instead (pages in language).

I also understand that a mini-site would probably work best.

Although currently, I am limited to only 1 page, and under this circumstance, my objective is what would work best to rank higher in SERPS.

I just want to be discovered by someone who searches in their native language. Although, this someone would only be a potential if they can read and speak english, so I only want and need one landing page per language (due to the nature of the business).

Which structure would probaly work best SEO wise?

1) www-mydomain-com/italian/index.html
2) www-mydomain-com/italian.html
3) italian-mydomain-com
4) www-mydomain-it

Keep in mind that a new domain or sub-domain would only have 1 page that links to the main site of 1000 pages.

The main site ranks extremely well and has a lot of weight (10 years old), so I'm wondering if option 1 or 2 may work best. Do you think that an italian search engine would factor in the whole site's weight even though it only finds 1 italian page? I don't care if it doesn't index the english pages, but I do care that the italian page ranks well.

So to benefit from the established domain, the question would be: Is Option 1 better than Option 2?

Would Option 3 (sub-domain) get any benefit from the established domain?

Any opinions or thoughts appreciated.

Thanks