One of the most powerful leadership tools aproject manager is has his/
own knowledge
own experience
own behavior
own reference

Own Experience

Explanation:

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One of the most powerful leadership tools a project manager has is his/her experience

The most effective leadership trait a project manager can have is experience. Knowing what works and what doesn't can mean the difference between a successful project or a failure. A leader with experience has already developed the behavior needed to deal with the employees, as well as make sure everyone is doing what they are supposed to. They also have dealt with many common leadership problems and know how to solve them in a quick and timely manner. This way things move forward according to plan.

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answer; i believe the correct answer is ( a expression) plz check first.good luck