I just need short answer

4. Justin Learns a Lesson

Eight-year-old Justin decides to wrestle with an older boy, Jeff, who lives down the block. They are having fun until Justin decides to get a stick and play "swords." He hits Jeff with the stick. Jeff is angry but he simply picks up his book bag and goes into the house. Justin is disturbed that his friend left and never hits Jeff with a stick again.

1. Is this an example of classical or operant conditioning?

2. What behavior is changed over the course of this scenario? Does it increase or decrease?

3. Is this an example of punishment or reinforcement? Positive or negative?