Question $27(1$ point$)$

A collective agreement provides that employees are entitled to $$150$ towards the purchase of new safety boots each year. However, the employer has had a practice of providing $$200$ towards safety boots. A new HR manager has discovered the error and has instructed all managers that only $$150$ will be provided, as stated in the collective agreement. In this situation, which of the following is correct?

The principle of estoppel prevents the employer from enforcing the original clause in the agreement.

The employer cannot unilaterally enforce the original clause in the agreement unless it provides notice to the union.

The employer can rely on the management rights article to enforce the original clause in the agreement.

The employer can unilaterally enforce the original clause in the agreement as both sides had originally agreed to it$.$

The principle of estoppel prevents the union from filing a grievance if the employer chooses to enforce the original clause.