The Odyssey Questions Book 23: How does Penelope outwit Odysseus in this book

Book 23

1. How does Penelope outwit Odysseus in this book?
2. What explanation does she give for not acknowledging Odysseus sooner?
3. Can you identify a scene in this book that you think would have made a good place for the Odyssey to conclude (rather than continue with the rest of this book and Book 24)?