Problem: Penny is an accounts payable clerk who has just returned from a pregnancy leave. During her leave, her employer hired a substitute, who has mastered the job and has become a permanent employee. Without consulting Penny, the employer assigns her to a different job that requires similar skills and has the same level of pay, hours of work, and general working conditions.

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Question: What are the employer's legal obligations and workplace options in this situation? Provide justifications and citations for your responses.