Answer: Servant leadership
Step-by-step explanation: In simple words, it refers to the leadership style in which the leader focuses to serve its subordinates rather than motivating them to achieve the goal for which the while team is working for.
In the given case, the management tries to make the janitors feel that their job is important for the whole process and they are a part of a big objective.
Hence from the above we can conclude that the given case depicts servant leadership.