https://data.grammarbook.com/blog/who-vs-which-vs-that/who-vs-that/
"Rule: Who refers to people. That may refer to /people/, animals, groups, or things, but who is preferred when referring to people.
Example: Anya is the one who rescued the bird.
NOTE: While Anya is the one /that/ rescued the bird /is also correct/, who is preferred."