Erika is listening to her professor discuss the details of quantum physics. She finds it difficult to concentrate during the lecture because she did not get sufficient sleep last night and is now feeling irritable and sleepy. According to the video lecture, Erika is having trouble receiving the messages sent by the professor because of noise.

Erika is a human resource manager at bluetel inc., a software company. she receives a call from an hr manager at another software company asking about marshall, a software engineer who used to work at bluetel and has applied for a job at the caller's company. erika checks the company's records and sees that a coworker had accused marshall of racial discrimination, but an investigation did not turn up any evidence to support the charge. marshall left the company two months later, saying he was no longer comfortable there. erika is concerned about sharing the details of this situation with the caller. if telling the information to the caller leads to the other company not hiring marshall, what potentially unlawful behavior could marshall accuse bluetel of engaging in?