Which of these is used after a printed word or quote to show that it has been copied exactly from the source?

I had always wondered what [sic] meant! Now I know. Thanks, Quizzland!

I asked my senior year in high school literature teacher to explain "sic" and she said she had never heard of it

I've not heard of the word sic

Quá điều kỳ điệu

When I was going to Catholic school in my country, we have to say our prayers in Latin. Now I am trying to remember all those prayers.