Which of the following correctly assign the string hello to a String?

Question $12$ options:

StringBuilder str $=$ new StringBuilder$("$hello$")$;

String stt $=$ str$.$toString$()$;

String st $=$ new String$("$hello$")$;

String st $=$ "hello";

char$[]$ hello $=\{\text{'}$h$\text{'},\text{'}$e$\text{'},\text{'}$l$\text{'},\text{'}$l$\text{'},\text{'}$o$\text{'}\}$;

String st $=$ new String$($hello$)$;