Stacey, the manager of Mill Town Ltd$.,$ decides to take action on her team because they are not meeting their sales quotas. She calls a meeting and informs her employees that if they do not meet the quota next month, she will raise their required quota by $10\%$ for the following month. Which of the following learning principles is Stacey using?

Punishment

Social learning

Extinction

Positive reinforcement

Negative reinforcement