Extended product: refers to the sum of the various benefits that the customer has incidentally acquired when purchasing the product. Which of the following are extended products? ['A 4S shop promises that customers who purchase a car worth more than 250,000 will be given a year of insurance.', 'Platinum card users enjoy 20% discount on shopping in a mall.', "The New Year's offer in a shopping mall is that the top 100 customers can buy a new mobile phone for only 100 yuan.", 'Microsoft introduced its upgraded Vista operating system after XP system to meet customer needs.']