Which sentence is correctly punctuated?

“I’ve waited years for this day, Kwan said, and now it’s finally here.”
“I’ve waited years for this day,” Kwan said, “and now it’s finally here”
“I’ve waited years for this day, Kwan said, “and now it’s finally here.”
“I’ve waited years for this day,” Kwan said, “and now it’s finally here.