WHO is always reffering to a person. The use of THAT reffering to a person can also be correct but a skilled and careful writer will always choose who.
The tennis player, who also plays soccer, is called Roger Federer.
THAT can reffer to a person (not preferable), animal or thing.
He bought the dog that had the pink collar.
WHICH reffers to a thing only.
The dictionary, which is at the front of the classroom, contains all the English words.
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