Characteristics of Transformational, Authentic, and Servant Leadership

Briefly define and discuss the major characteristics of transformational, authentic, and servant leadership.
Do you observe any overlapping characteristics?

 Explain your reasoning
What are some characteristics that make transformational, authentic, and servant leadership different and possibly even incongruent? 

Provide examples (from the workplace/contemporary issue/ personal) to illustrate your responses.
Which of the theories do you see as being more useful to future leaders and researchers, and why? Include a brief discussion (2-3 sentences) on how you could apply at least one of the theories in current or future leadership roles (focus on a specific context).
Cite at least two peer-reviewed sources in addition to Northouse (2022) to support your discussion.