Describe Tim Costello approach to leadership, drawing on at least one leadership theory from the academic literature. Provide evidence to support your assessment of their leadership approach. That is, describe two or three specific examples of actions they have taken that demonstrate this particular leadership approach you have described.What are two key challenges they have faced as a leader? How have they managed this challenge? What could they do differently to be even more effective?refer to at least 10 references, 8 of which need to be academic references. These could be references about the leadership theory, references about important leadership capabilities that this person has had to demonstrate (such as creating a strong organisational culture, creating a motivating environment, influencing others or managing change).must acknowledge the source of all articles used using the Harvard System. You must reference any material you use which is not your own.What have you learned about leadership from studying this particular leader?