Answer:
Tiffany would likely have   expert   power over a new sales rep.
Explanation:
Refering to business, the are five forms of power through wich the workers may influence others in an organization: legitimate, reward, expert, referent, and coercive.
The legitimate power comes from formal authority: bosses have the authority to ask others to perform tasks.
Reward power comes from the fact that one person can pay or reward, either with money or with some non-financial incentive.
Expert reward is exerted by a person in virtue of the knowledge on a matter or skills to perform a task, thus he/she can influence others. This is exactly what Tiffany would likely have because the has a lot of experience performing a good job as sales rep/
Referent power is exerted in virtue of the respect or admiration
Coercive power is exerted when the person can impose a punishment.
