Hasan, a unionized employee, normally works night shifts with his employer.Hasan has recently incurred a medical condition affecting his physical abilities and strength.As a result, he told his employer that due to this medical disability, for the next year, he needs to be able to work during the day shift, and not his normal night shift.The employer says that it would be illegal and impossible for it to allow this, since the collective agreement in place allows certain workers to claim day shift work because they have more seniority than others, including Hasan.Explain the relevant law here in determining whether the employer's statement is correct. Canadian **