Answer: Servant leader
Explanation: Servant leader is that leader whose main goal is to serve his followers and subordinates. All the actions that a servant leader takes is to make sure that the needs of his followers are taken care of.
This theory is sometimes used in management also we the perception that employees are the most important asset and if they are provided with proper facility their productivity will be at full, leading to development of organization.
In the given case, Starbucks CEO is taking utmost care of his employees. Hence, it is clearly a Servant leader example.