Over dinner, Darla, Harold, and Mandy are talking about their managers. Darla describes her manager as a very motivating person. Work goals are very demanding and challenging, but even though the rewards of the hard work may not come soon, Darla trusts her boss's emphasis on the future rewards that will come from their work. Darla feels that working with this new leader has led to a much stronger emotional bond with the firm, much more work engagement, and an increase in her job satisfaction. Darla's boss can be considered as a(n) ________ leader.