A collective agreement between a union and an employer (a grocery store) contains a management rights article and an article relating to technological change) The agreement does not refer to parking) The employer has established rules requiring employees to register their cars with the employer and leave their cars in a specified area) In this situation, which of the following is correct? 1) The employer can rely on the management rights article to establish the parking rules) 2) The employer cannot establish the rules because parking is not referred to in the collective agreement) 3) The employer must obtain the unional's consent to the rules) (4) The principle of estoppel prevents the employer from establishing the parking rules) ( 5) The employer can rely on the technological change provisions in the collective agreement to establish the rules)