Which sentence is punctuated correctly?


Ralph Waldo Emerson once said, ‘A foolish consistency is the hobgoblin of little minds.’

Ralph Waldo Emerson once said, “A foolish consistency is the hobgoblin of little minds.”

Ralph Waldo Emerson once said, A foolish consistency is the hobgoblin of little minds.

Ralph Waldo Emerson once said, A foolish consistency is the hobgoblin of little minds.