History: Which of the following are in order from the harshest sound to the most gentle sound?

Which of the following are in order from the harshest sound to the most gentle sound?

• Sawtooth, Rectangle, Square, Triangle, Sine
  Yes, this is correct!
• Sine, Triangle, Square, Rectangle, Sawtooth
  The order is in reverse. Though none of them are particularly pleasant to listen to.
• Sawtooth, Triangle, Square, Rectangle, Sine
  Triangle is a gentle sound.
• Sine, Rectangle, Square, Triangle, Sawtooth
  This sequence is completely out of order.