Chloe, when selected as a senior engineer by her company, is promised that she would start working on live projects within three months from her joining date. She signs a contract stating that she would give three months notice before quitting the job. Which of the following statements is true of the given scenario?

A. Chloe is an at-will employee.

B. The supervisor has violated an employment law by making a promise.

C. Chloe has an implied contract with the company.

D. The supervisor cannot be challenged in a court.