Which was your favorite instrument out of the seven shown in the video, and why.

For the first introductory week of the class, please watch the video on history and various styles of guitar here: https://www.youtube.com/watch?v=AjK4GVR1EcE
1. Which was your favorite instrument out of the seven shown in the video, and why.
2. Which instruments were played by fingernails, and which weren’t? Which one used a pick/plectrum?
3. Which instrument had frets, and which did not?
4. What is older, sheet music or tab, and were you aware of that?