Hello. I am super confused about the state command including the xi and country and year fixed effects with clustered standard error at the country level. Can someone help me with this? My commends are below:

1: xi: reg y x1 x2 i.year i.country, vce(cluser country)
2: xi: reg y x1 x2 i.year, vce(cluser country)
3: xi: reg y x1 x2 i.year i.country, r

I don't know which one I should use. Any advice would be wonderful! Thank you so much!