The correct answer to this open question is the following.
Unfortunately, you forgot to include the options to choose from. Without those options, we can only help you answer based on general terms.
Once clarify that. we can comment that the disciplines that have contributed to leadership research, thought, and study is sociology, psychology, communications, and anthropology.
The leader has to lead by example. It has to be a great communicator, a good listener. Have a set of skills and abilities to perform under pressure. The leader has to make the toughest decisions. And of course, he has to hire the best individuals to form a true team. A good leader should be proactive and ready to make aggressive decisions. He has to lead by example.