Which structure of multilingualism in url is better?

Question

Search Engine Optimization

I am making a website that will be translated into several languages ​​(first Russian and English, then French, German, Spanish, etc., i.e. will expand). In this connection, the question arose, which url education system to choose for SEO and convenience?
1) [lang].site-name.com/[post id, does not change depending on language]
2) site-name.com/[lang]/[post alias, changes depending on language]
3) site-name .com/[post id, does not change depending on language]/[lang]
4) site-name.com/[lang]/[post id, does not change depending on language]

Answer 1

Simple common sense dictates that 1 and 3 don't make sense at all.
If you are promoting a national site, regardless of the main one - a subdomain and CNC.
If you promote multilingual - section and CNC.
If you do not promote at all - section and id.

Answer 2

site-name.com/[lang]/[post alias, varies by language]
Why does the alias need to change by language? Are you going to write in Arabic CNC?