If we changed the subject of the sentence: "She knows what she wants..." for THEY. What would be the writing in the affirmative form? (Como ficaria a escrita correta, se trocássemos o sujeito por THEY na forma afirmativa)

1)They do know what they do want.
2)They know what they want.
3)Do they know what they want?
4)Do they knows what they wants.